Changelog for VirtualBox 4.3

This page lists all changes of the VirtualBox 4.3 releases.
All branches: 4.3 · 4.2 · 4.1 · 4.0 · 3.2 · 3.1 · 3.0 · 2.2 · 2.1 · 2.0 · 1.6

VirtualBox 4.3.22 (released 2015-02-12)

This is a maintenance release. The following items were fixed and/or added:

• VMM: refined measurement of TSC frequency on the host, improves timekeeping for guests
• VMM: decreased CPU load resulting from guest MMIO writes to the virtual APIC
• VMM: fixed interception of debug exceptions, observed while using the dbx debugger on Solaris guests (VT-x only)
• GUI: 3D overlay window positioning code improved, fixed potential misplacement of 3D accelerated guest graphics content
• GUI: fixed accident SSL authentication failures during update check on Windows hosts (bug #12969)
• GUI: never send the "ACPI power" keyboard scancode to the guest, we have the ACPI power button for that
• GUI: was unable to properly restore seamless mode VM from snapshot/saved-state under some circumstances
• VBoxHeadless: don't crash if 3D is enabled in the VM settings (bug #10250)
• ATA: fixed several passthrough issues (bugs #12310, #1360)
• Audio: fixed DirectSound failure when the the host has no audio input device (Windows hosts only; bug #9205)
• SB16: fixed compatibility issue (bug #13769)
• Storage: fixed broken CD/DVD passthrough when using the IDE controller (bug #12310)
• NAT: new ping proxy for Windows hosts (bug #11871)
• NAT: Properly report outbound connect(2) failures to guest with TCP RST or ICMP (bug #10525)
• NAT Network: no need for frequent wakeups in VBoxNetDHCP and VBoxNetNAT (bug #11681)
• Host-only adapter: prevent Windows from creating an "Unidentified network" (bug #9688)
• Bridged Networking: don't leak host-to-guest traffic to the wireless network when bridging to a wireless interface (bug #13714)
• Main: fixed a possible race when changing the medium leading to a deadlock under rare conditions (bug #13722)
• VBoxManage: fixed return code if starting a VM failed (bug #13773)
• Settings: on Windows host, do not use environment variable HOME at all, the settings location is derived from the user profile directory
• API: fixed 2 deadlock opportunities related to medium handling (bugs #13789, #13801, thank you Alexander Urakov)
• API: fixed bug in XPCOM which created too few worker threads, sporadically resulting in a deadlock (bug #13802, thank you Alexander Urakov)
• SDK: fixed a garbage collection leak in the Python VirtualBox webservice API binding (bug #13817)
• Linux hosts: fixes for activated SMAP (Broadwell and later, bug #13820)
• X11 guests: prevent unwanted hiding of guest screens on multi-monitor guests (bug #13287)
• X11 guests: added support for X.Org Server 1.17
• X11 Additions: fixed a memory leak in VBoxService if libdbus is available but dbus-daemon isn't running (bug #13770)
• Windows Additions: prevent VBox WDDM driver from loading if host reports weak OpenGL capabilities. 3D content now can be shown over Remote Desktop connection.
• Windows Additions: some fixes for recent Windows 10 Previews
• Linux Additions: fixed a compatibility issue with 64-bit Linux 2.4 kernels
• Linux Additions: fixed a potential use-after-free when unloading the VBoxGuest module
• Linux Additions: Linux 3.19 fixes (bug #13741)

VirtualBox 4.3.20 (released 2014-11-21)

This is a maintenance release. The following items were fixed and/or added:

• VMM: fixed reboot hang of 32-bit Windows SMP guests (bug #13319, #13462)
• VMM: proper Math Fault handling with certain legacy guests (bug #9042, AMD hosts)
• VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT on older CPUs that don't support MSR-bitmaps (VT-x only; bugs #13034, #13125, #13311, #13425, #13426, #13463, #13585)
• GUI: fix 3D overlay window re-parenting issue when VM goes to full screen mode on X11 hosts.
• GUI: fix occasional loss of focus in full-screen mode on X11 host systems (4.3.16 regression)
• GUI: Mac OS X: wizards should have Cancel button (bug #12541)
• GUI: added a global option to prevent automatic raising of the new window by mouse move with multi-screen guests (bug #8878)
• API: accept remote display port 0 as the default RDP port (bug #8534)
• VBoxManage: fixed crash when executing showvminfo command under certain circumstances (bug #13190)
• ACPI: fixed occasional Guru Meditations in ACPI timer code (4.3.18 regression; bug #13521)
• EFI: improved performance of IDE disk access
• EFI: fixed a bug in the EFI video driver which prevented Windows to boot in UEFI mode (bug #12022)
• EFI: properly announce the amount of RAM for big VMs (bugs #11103 and #13211)
• Storage: fixed a crash under certain circumstances when a medium was ejected from a drive attached to the SATA controller without inserting a new medium before pausing or closing the VM (4.3.16 regression)
• Storage: fixed an interrupt acknowledge issue causing hanging guests or slower I/O (4.3.18 regression)
• Storage: fixed broken resume after the VM was suspended due to a full disk if host I/O caching is used
• Storage: fixed a Guru Meditation under certain conditions when using the DevLsiLogic controller with VMs running in raw mode (4.3 regression; bugs #12254, #12655, #12709, #12774, #12886)
• Guest Control: fixed a bug which might lead to a crash during recursive copy
• SDK: Java COM bindings fixes
• iPXE: enable the HTTP download protocol (bug #13628)
• Runtime: do not use a fixed stack size creating temporary threads during initialization (bug #13038)
• Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting (4.3.14 regression; bug #13187)
• Windows hosts: fixed DirectSound host audio failure under certain conditions (bug #13418)
• Windows hosts: fixed additional cases of 4.3.14 regression whereby AltGr stopped working for some people (bug #13216)
• Windows Additions: preserve guest monitor layout when resizing Windows 7 or newer guests
• Linux Additions: Linux 3.18 compile fixes (bug #13515)

VirtualBox 4.3.18 (released 2014-10-10)

This is a maintenance release. The following items were fixed and/or added:

• VMM: fixed a potential misbehavior after restoring the A20 state from a saved state
• GUI: fixed full-screen mode mini-toolbar related regressions for different platforms and window managers (bug #13369)
• GUI: X11: fixed full-screen mode Unity panels quirk caused by mini-toolbar code changes in last release (bug #13365)
• GUI: X11: added possibility to use legacy full-screen mode as the new one can cause multi-screen issues under Unity, see the manual for more information (bug #13365)
• GUI: Mac OS X: fixed full-screen mode artifact causing black screen when 3D acceleration was enabled on 10.10 Yosemite hosts (bug #13448)
• GUI: Mac OS X: fixed regression in user-space swiping from/to VBox in full-screen mode
• GUI: Mac OS X: fixed issue with switching to VBox in full-screen mode through Alt+Tab and Mission Control
• Storage: fixed data corruption when resizing huge VHD images under certain circumstances (bug #11960)
• Storage: fixed a rare hang during startup when the BIOS enumerates the storage devices attached to the SATA controller
• Storage: follow the spec with AHCI interrupt acknowledge (bug #13474)
• Storage: fixed broken iSCSI authentication (4.3.14 regression, bugs #13386, #13435)
• NAT Network: properly parse port forwarding rules to allow UDP rules
• USB: fixed a crash on Linux hosts with older Linux kernels (bug #13400) and several other fixes
• ACPI: fixed ACPI timer anomalies (bug #12076)
• Guest Control: fixed a memory leak (bug #13434)
• Main: when removing a VM, do also remove the VBoxStartup.log file which might exist on Windows hosts (bug #13478)
• Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting (4.3.14 regression; bug #13187)
• Windows hosts: propagate the process startup information to the child process (4.3.14 regression; bug #13243)
• Mac OS X hosts: don't force using the discrete GPU (bug #11111)
• Windows Additions: some Windows 10 tweaks
• X11 guests: fix a bug handling video driver display properties which prevented GNOME Shell on Fedora 21 from starting
• Linux hosts / guests: fixed a few remaining warnings in the kernel log if memory allocation fails (bug #11171)

VirtualBox 4.3.16 (released 2014-09-09)

This is a maintenance release. The following items were fixed and/or added:

• VMM: fixed restoring 32-bit FPU state on 64-bit capable VMs and restoring guest FPU in raw-mode VMs (bug #12646; 4.3 regression)
• GUI: properly restore normal/scale mode guest-screen size after exiting full-screen/seamless mode
• GUI: mini-toolbar should provoke less artifacts/conflicts with 3D guest rendering
• GUI: Mac OS X: Native full-screen multi-screen transition was able to blackout host-screens for nearly minute
• GUI: X11: Modern window managers should now use native full-screen multi-screen mapping API
• GUI: added extradata item for configuring the mouse capture behavior, see the manual for more information (bug #3506)
• Storage: fixed a VBoxSVC crash when querying an iSCSI target with authentication configured (4.3.14 regression)
• Storage: fixed a rare data corruption during reads if another allocating write is running concurrently and accesses the same range
• Storage: fixed a rare crash for certain VHD images from other products
• Storage: fixed a rare release assertion when using the AHCI controller
• Floppy: fixed read errors and guest memory corruption when running under control of QEMM
• 3D: added experimental support for rendering on offline GPUs for Mac OS X host
• 3D: fixed white window appearing on entering the full screen mode on OSX host
• 3D: fixed video recording support for 3D data regression (bug #13073)
• 3D: fixes for MS Office 2013 support
• 3D: several fixes
• Bridged Networking: improved IPv6 support when bridging to a wireless interface
• NAT: prevent internal DNS service from stuck in host-resolver mode when host was switched from one network to another one while host was sleeping (Mac OS X hosts)
• NAT: preserve DF (if possible) and TOS when proxying outbound UDP datagrams (bugs #9440, #12309)
• NAT: don't let multicast datagrams out (bug #7338)
• NAT: fixed handling of large incoming UDP datagrams on Windows hosts (bug #12136)
• NAT: fixed handling of the RFC 1533 DHCP PAD option
• NAT Network: fixed inbound half-close on Windows hosts
• NAT Network: preserve IPv4 DF (if possible), TTL, TOS and IPv6 Hop Limit when proxying outbound UDP datagrams
• VRDP: fixed a rare crash when using remote audio input
• USB: fixed several regressions from 4.3.14 (bug #13320)
• Audio: made the HDA sound emulation work with certain OSX guests (e.g. Mountain Lion)
• Windows hosts: fixed startup problems on certain Windows hosts due to conflicts with anti-virus software (4.3.14 regression, bug #13187)
• Windows hosts: fixed 4.3.14 regression whereby AltGr stopped working for some people (bug #13216)
• X11 hosts: made the extra key on Brazilian Thinkpads work (bug #8745)
• X11 hosts: fixed a problem of input focus cycles and immediately released key presses in full screen mode (bug #13238)
• Linux hosts: fixed flooding the kernel log with USB related messages when passing through certain USB devices to a VM (bug #13085)
• Linux guests: stop applications crashing when drm_wait_vblank is called (bug #13265)
• Linux guests: fix a crash in gnome-session (bug #13335)
• X11 guests: do not start VBoxClient over an SSH connection (bug #13107)
• X11 guests: added support for X.Org Server 1.16 (bug #13207)
• X11 guests: fixed a wrong parameter in the video driver which caused problems with full-screen X11 clients (bug #2748)
• VirtualKD: introduced stub/loader device for speeding up Windows kernel debugging, details see ​http://virtualkd.sysprogs.org/

VirtualBox 4.3.14 (released 2014-07-15)

This is a maintenance release. The following items were fixed and/or added:

• VMM: more fixes for MSR emulation on certain hardware (bugs #12784, #12949, #13034)
• VMM: improve MSI handling under rare circumstances (only relevant for the ICH9 chipset)
• VMM: fixed #UD exception for 64-bit guests with the EFER.SCE bit and the SYSCALL instruction (VT-x only; 4.3 regression; bug #13008)
• VMM: fixed timekeeping after resuming SMP guests
• VMM: properly wake up a halted VCPU on NMI/SMI
• GUI: fixed a potential crash
• GUI: fixed stuck AltGr key on Windows hosts (bug #2537)
• GUI: fixed a potential error during the version check
• GUI: shortcut change should not require Enter/Return (or other trigger) to confirm (bugs #12828, #12847, #12937, #13087)
• GUI: fixed update check which was broken due to changing the location of the root certificates (bug #13096)
• VBoxManage: fixed typo in showvminfo --machinereadable (bug #13176)
• NAT: fixed inbound half-close (bug #13116)
• NAT: fixed slow upload speed under certain conditions (bug #10034)
• NAT Network: fixed potential loss of inbound TCP data
• NAT Network: fixed potential infinite stalls of TCP connections over IPv6
• NAT Network: fixed resets of TCP connections on Windows hosts
• NAT Network: fixed inbound half-close on Mac OS X hosts
• NAT Network: fixed socket leak on Solaris hosts
• NAT Network: fixed ping of mapped host loopback on Mac OS X and Solaris hosts, fixed proxying of IMCP errors on Mac OS X
• Host-Only Network: fixed SNMP ifConnectorPresent value on Windows (bug #13143)
• Storage: fixed a possible crash with CD/DVD passthrough under certain circumstances
• Storage: fixed a crash when trying to open an inaccessible QED or QCOW image (bug #12613)
• Storage: fixed data corruption or read errors under rare circumstances
• AHCI: fixed a crash under rare circumstances
• USB: performance fixes
• ICH9: properly reset MSI capability on reset
• Keyboard: active modifier keys during suspend were stuck after resuming the host
• 3D: fixed misbehavior with huge guests (i.e. guest more than 4GB guest memory
• 3D: several fixes
• API: properly detect the Windows 8.1 guest OS type (bug #13090)
• ExtPack: cleanup of dangling uninstallation directories
• Linux hosts / guests: compile fix for EL7 (bug #12638)
• Linux Additions: made 3D pass-through work with recent versions of Mesa in the guest (bug #12941)
• Linux Additions: Linux 3.16 fixes (bug #13123)
• Mac OS X hosts: when scanning for host CD/DVD devices also consider BlueRay devices
• OS/2 Additions: fixed gengradd.dll library name (bug #12785)
• Solaris Additions: fixed permissions of files and directories located on shared folders
• Windows host installer: fixed the need for rebooting Windows after installation or upgrade, extended logging for NetFlt/NetAdp (un)installation

VirtualBox 4.3.12 (released 2014-05-16)

This is a maintenance release. The following items were fixed and/or added:

• VMM: fixed an occasional Guru Meditation (Mac OS X hosts only; bugs #12727, #12954)
• VMM: fixed a rare condition that would fail to invalidate guest TLB entries or would invalidate them when not required (Windows hosts only)
• VMM: fixed a VERR_NOT_SUPPORTED Guru Meditation seen with certain guests, e.g. OpenServer 5.0.7
• VMM: more fixes for MSR emulation on certain hardware (tickets #12240, #12875)
• GUI: fixed mouse positioning with mouse integration disabled and multiple guest screens (Windows hosts only; bug #9059)
• GUI: fixed crash in VM manager (bug #12878)
• GUI: fixed crash under rare conditions on entering/exiting full screen / seamless mode
• Shared Clipboard: don't stop working after taking a snapshot (bug #12700)
• AHCI: fixed a crash under rare circumstances
• API: fixed a hang during VM shutdown under rare conditions
• NAT: fixed generation of malformed ICMP error datagrams (4.3.10 regression)
• NAT: fixed potential crash in DNS proxy
• NAT Network: don't drop port forwarding rules after some time
• NAT: fixed ARP cache corruption and network loss in Windows guest caused by iSCSI service activity
• USB: improved check if a storage device is currently mounted to the host when the device is about to be attached to the VM (Mac OS X hosts only; #11038)
• 3D support: several fixes, including better support for Ubuntu 14.04
• VRDP: fixed a potential crash on client disconnect (bug #12858)
• VBoxSVC: fixed a race when a new client is started a few seconds after the last client terminated (Windows hosts only; bugs #11309, #12509)
• VBoxSVC: fixed VirtualBox.xml registry corruption after VM renaming
• VBoxSVC: fixed a potential crash caused by incorrect USB device filter (Mac OS X hosts only; #11038)
• Windows hosts: partly support 32-bit COM on 64-bit systems
• Windows host installer: implemented merge module (msm) support
• Linux hosts: fixed dependency of boot script on older Debian systems (bug #12262)
• Linux guests: fix symbolic link to shared folder helper (bug #12879)
• Linux Additions: don't crash VBoxService during guest execute for users without a password (bug #12994)
• Linux Additions: fixed a bug in guest execution where the guest process terminated with VERR_INTERRUPTED to the host

VirtualBox 4.3.10 (released 2014-03-25)

This is a maintenance release. The following items were fixed and/or added:

• VMM: more work on improving the emulation of certain MSR registers on certain host CPUs (e.g. bugs #12734, #12736, #12744, #12748, #12686, #12770)
• VMM: fixed single-stepping for real-mode guests (VT-x without unrestricted guest execution) and some I/O instructions (bug #12636)
• VMM: fixed a potential problem with COW pages if nested paging is not available
• GUI: Mac OS X: experimental native full screen support for Mountain Lion and Mavericks (bug #12292)
• GUI: Mac OS X: removed the mini-toolbar minimize button which doesn't work under Mac OS X full screen mode anyway
• GUI: experimental HID LEDs synchronization for Windows and Mac OS X hosts: fixed keyboard re-synchronization if the feature is disabled (as done by default; bug #12758)
• GUI: fixed a potential crash when opening the preferences menu (bug #12862)
• OVF: fixed a crash of the VirtualBox Manager when re-starting guest export (bug #12586)
• 3D support: several fixes
• HGCM: fixed a problem with saved states which could cause several guest misbehavior after a VM was started from a saved state
• Storage: fixed a bug preventing to compact differential snapshots under certain conditions
• VBoxSVC: fixed a segmentation fault on Linux hosts if a very long path exists under /dev (bug #12760)
• API: fixed guest misbehavior under certain conditions if a storage medium was attached or removed at VM runtime
• Windows installer: make the --silent parameter work again (bug #12764)
• Mac OS X Networking: prevent local traffic (VM-to/from-host) from leaking to wire (bug #12750)
• Windows Additions: fixed the environment for guest processes (4.3.8 regression; bug #12782)
• Windows Additions/WDDM: fixed divide by zero exception with multiple guest screens under certain conditions
• Windows Additions/WDDM: fixed crashes with 2D video acceleration enabled (4.3.8 regression; bug #12745)
• Linux Additions: install correctly on Ubuntu guest systems with a /usr/lib64 directory (bug #12513)
• X11 Additions: fix for the VBoxClient process not exiting correctly (bug #12348) and consuming too much processor time

VirtualBox 4.3.8 (released 2014-02-25)

This is a maintenance release. The following items were fixed and/or added:

• VMM: more work on improving the emulation of certain MSR registers (e.g. bugs #12224, #12544)
• VMM: fixed a VERR_INVALID_RPL Guru Meditation when booting certain guests (bug #11350)
• VMM: experimental support for SSE 4.1 / SSE 4.2 passthrough, see the manual for more information how to enable it (bug #8651)
• VMM: fix for recent Linux kernels with software virtualization
• GUI: experimental HID LEDs synchronization for Windows hosts, see the manual for more information
• GUI: warn the user if the Oracle Extension Pack is not installed and the user tries to activate the remote display feature (bug #9104)
• GUI: make sure that a minimized guest (using mini toolbar in full screen / seamless mode) keeps the minimized state (bug #12199)
• GUI: popup banner's "do not show this message again" check-box replaced with corresponding button
• GUI: network adapter cables can now be connected/disconnected directly through the running virtual machine Devices / Network menu a Network status-bar indicator
• GUI: the new VM wizard now proposes 64-bit guests on 64-bit hosts by default; better distinction between 32-bit OS types 64-bit OS types (bug #12533)
• GUI: better error message if appliance import fails (bug #12657)
• GUI: allow to set host-combination to 'None' using the Global settings / Input page (bug #12730)
• GUI: don't switch the guest to a black screen during online snapshot merge (4.3 regression)
• VBoxManage: when exporting an appliance, support the suppression of MAC addresses, which means they will be always recreated on import, avoiding duplicate MAC addresses for VMs which are imported several times
• AHCI: fixed a VM hang during suspend under certain circumstances
• AHCI: fixed a VM hang during online snapshot merge under certain circumstances
• AHCI: fixed a bug which resulted in Windows XP guest hangs if a SATA CDROM is attached (bug #12417)
• AHCI: fixed a Guru Meditation under certain conditions
• AHCI: ejecting a CD/DVD medium failed under certain conditions
• AHCI: disk hotplugging fixes
• NAT: transparent handling of host sleep/resume and network configuration changes if the dnsproxy is enabled or if the hostresolver is used (bug #12441)
• NAT: fixed crash and misbehaviour under some circumstances with ICMP packets having TTL=1
• NAT Network: fixed IPv6 reassembly
• NAT Network: ping proxy implemented
• OVF: fixed reading of the OVF 0.9 section element (4.3 regression; bug #12345)
• OVF: several fixes
• 3D support: several fixes, multiscreen fixes (e.g. bug #9124)
• 3D support: include 3D content in captured videos (bug #12666)
• 3D support: include 3D content in captured screenshot (bug #11758)
• VGA: proper handling of legacy graphics modes if the Guest Additions are active (bug #6649)
• USB: fixed crash during isochronous transfer under rare circumstances
• BIOS: better disk geometry handling of SCSI drives
• API: fix crashes in Java API clients using the XPCOM binding, happened with output parameters only (bug #11232)
• VBoxSVC: documented the handling of host power management events (see the manual for more information) and added an extradata item for configuring the handling of the battery-low event (bug #9925)
• VBoxSVC: fixed a bug which could trigger a crash if a VM snapshot was restored the second time and the VM has associated bandwidth groups (bug #12569)
• VBoxSVC: properly detect ifconfig if located in /bin (bug #12713)
• Shared Folders: fixed a failure to restore transient shared folders when starting a VM from a saved state (bug #12578)
• Mac OS X hosts: fixed issue when the application icon was frozen in the dock if the bridging interface was not connected to a network (bug #12241)
• Linux hosts: also consider the physical package ID when determining the number of physical CPU cores
• Linux hosts / guests: don't warn in kernel log if memory allocation fails (bug #11171)
• Solaris hosts: fixed the autostart SMF script (bug #11720)
• Windows hosts: fixes for non-ANSI code page user names and similar environment contents (bug #12596)
• Windows hosts / guests: fixed setting and using a guest user's process environment variables (relevant for Guest Control)
• Windows Additions: fixed handle leaks in VBoxTray (bug #12563)
• Windows Additions: fixed a crash while detecting active guest users
• Windows Additions: fixed restoring backed up D3D files on XPDM -> WDDM upgrade
• Guest Control: fixed setting and using a guest user's process environment variables
• Linux Additions: support Enterprise Linux 6.5 kernels (bug #12505)
• Linux Additions: fixed CPU hot-remove on newer Linux kernels
• Linux / Solaris Additions: don't automount a shared folder which is already mounted
• X11 Additions: support X.Org Server 1.15 (bug #12623)

VirtualBox 4.3.6 (released 2013-12-18)

This is a maintenance release. The following items were fixed and/or added:

• VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT caused by VMCB caching with nested paging on certain AMD CPUs (bug #12451)
• VMM: fixed a Guru Meditation VERR_VMX_UNEXPECTED_INTERRUPTION_EXIT_TYPE while intercepting debug exceptions (VT-x only; bug #12410)
• VMM: fixed a Guru Meditation VERR_SVM_UNEXPECTED_EXIT while intercepting debug register accesses (AMD-V only; bug #12481)
• VMM: fixed a VERR_SSM_STRUCTURE_MAGIC error when trying to load a saved state made with VBox 4.3.4 when VT-x/AMD-V is disabled. Unfortunately, VBox 4.3.4 produced broken saved states for this configuration so you have to discard these states (bug #12414)
• VMM: added a few more MSRs to the whitelist required by certain guests (bug #12245)
• GUI: fixed deleting of inaccessible VMs (4.3 regression, bug #12205)
• GUI: fixed warnings in VM settings / number of guest processors (bug #12480)
• Main: don't automatically enable 64-bit guests on 64-bit hosts if VT-x/AMD-V is not available (bug #12424)
• Main: always expose the DMI memory information to Windows 2012 guests (bug #12017)
• Main: fixed occasional crashes on guest display resolution change (bug #7063)
• Main: fixed reporting back temporary name when calling IGuestSession::DirectoryCreateTemp() (bug #12498)
• API: fix for a hang when launching a GUI VM through the API, which crashes due to GUI unavailability
• Storage: fix for BLKCACHE_IOERR runtime errors under rare circumstances (bug #11030)
• Network: allow to start more than 5 PCNet instances (bug #12426)
• E1000: if the cable was disconnected before the guest initialized the device, the link status was not properly set to 'down' after the initialization completed despite the fact that there was no connection
• 3D support: fixed offset of guest 3D image elements (Mac OS X Retina hosts only; bug #11021)
• Solaris hosts: fixed accessing the host driver from non-global zones (4.3 regression, bug #12271)

VirtualBox 4.3.4 (released 2013-11-29)

This is a maintenance release. The following items were fixed and/or added:

• VMM: fix for a bug in the Local APIC emulation causing a BSOD when booting certain guests (4.3.0 regression; bug #12240)
• VMM: fixed loading of saved states if VT-x/AMD-V was disabled (4.3.2 regression; bug #12291)
• VMM: fixed single-stepping inside the guest for certain instructions (VT-x only; bug #10947)
• VMM: fixed a performance issue involving APIC accesses after rebooting a VM (4.3.0 regression; VT-x only; bug #12296)
• VMM: fixed TPR patching to be enabled for 32-bit guests even when the chosen guest type is 64-bit (4.3.0 regression; AMD-V only)
• VMM: fixed occasional VINF_EM_TRIPLE_FAULT errors on hosts without the unrestricted guest execution feature (bug #12198)
• GUI: don't bother the user with the BPP warning if no Guest Additions are installed
• GUI: fixed machine-window paint artifacts on VM reboot / guest-screen resize
• GUI: make sure the assigned license and description are attached to the exported appliance
• GUI: fixed bugs in close VM action restrictions handling (bug #12333)
• GUI: fixed incorrect wizards text colors for some unusual look and feel styles (bug #11743)
• GUI: should restore seamless mode as soon as possible after VM reboot or shutdown
• GUI: fixes for medium enumeration
• GUI: the OS X hot corners were not accessible while a VirtualBox VM is running (Mac OS X hosts only; bug #4139)
• GUI: fixed an old bug which bared the host from cleanly shutdown / reboot if the VM selector window is open (Mac OS X hosts only; bug #8254)
• Host-only Networking: fixed creating of host-only network interfaces (4.3.0 regression; bug #12182)
• NAT: don't run into an infinite loop in case the host cannot access any DNS server (4.3.0 regression; bug #12300)
• NAT: don't re-connect the cable if the DNS information changes and the cable was disconnected before (4.3.0 regression; bug #12225)
• NAT: fixed several issues with automatically starting / terminating of NAT networks on VM start / stop and configuration changes
• VBoxNetDHCP: don't block prevent VBoxSVC from terminating (bug #12264)
• 2D Video acceleration: fix crashes on presentation mode switches (bug #9194)
• BusLogic: allow to run VMs with more than one BusLogic SCSI controller enabled
• Keyboard: fixed a VM crash if a VM was resumed from a saved state where at least one key was pressed (bug #11289)
• VBoxSVC: fixed a heap corruption under certain conditions (4.3.0 regression)
• VBoxSVC: fixed a race leading to a hang during initialization (bug #12349)
• OVF: fixed import logic for OVF appliances containing multiple VMs
• OVF: improved logic for finding an appropriate image format during OVF import
• API: block the removal of the current snapshot if it has child snapshots (only relevant for VMs without snapshottable hard disks, their presence always prevented removal), which resulted in VM configuration corruption
• API: mark VM configurations with snapshots but without current snapshot as inaccessible, as this combination is nonsense
• API: fixed information for some automatically generated events (only with XPCOM, Windows host was not affected), which caused errors when getting some of the attributes over the webservice (bug #12379)
• SDK: extended the functionality coverage for the C bindings
• Guest Control: various bug fixes and improved VBoxManage help (bugs #8072, #11044, #12336, #12338, #12346, #12371)
• Windows hosts: another attempt to fix the massive DPC latency (bug #6242)
• Windows host installer: make registering file extensions optional, contributed by Tal Aloni (bug #8009)
• Mac OS X hosts: properly sign the kernel extensions for Mavericks hosts (bug #12256)
• Mac OS X hosts: fixed a bug where the VirtualBox dock icon was not properly removed from the dock after a VM terminated preventing Mavericks hosts from shutting down (bug #12241)
• Mac OS X hosts: fixed minor installer issue (bug #12275)
• Linux hosts / guests: Linux 3.13 compile fixes (bug #12358)
• Linux guests: build the vboxvideo kernel module correctly on OL/RHEL 6.1 guests (bug #11996)
• Linux guests: make 3D work on Slackware 14.1 (bug #12320 comments 3 and 4)
• Guest Additions/3D: fixed an occasional dead-lock (bug #12319)
• Windows Additions/3D: fixed possible memory leaking (bug #12228)
• Windows Additions/XPDM: use separate tables containing valid video modes for each virtual monitor
• Windows Additions: fixed automatic logins for Vista and newer Windows guests (bug #12332)

VirtualBox 4.3.2 (released 2013-11-01)

This is a maintenance release. The following items were fixed and/or added:

• VMM: fixed restoring of the auxiliary TSC MSR in VT-x that caused host BSODs on Windows 8.1 hosts and unpredictable behavior on other hosts (bug #12237)
• VMM: provide fake values for a couple of MSRs to make more guests happy on certain hosts
• VMM: fixed detection of VT-x on certain machines where the BIOS would not set the VMX LOCK feature bit, which affected the VM settings in the GUI
• VMM: fixed TPR threshold which caused BSODs on Windows XP guests that use the I/O APIC (VT-x only; bug #12227)
• VMM: fixed PATM saved state incompatibility for software virtualized VMs (bug #12222)
• VMM: don't fail if AMD-V isn't available if the VM is configured to use software virtualization
• GUI: fixed guest resize breakage on visual representation mode change (when switching from normal to full screen etc)
• GUI: make sure the guest screen is resized after restoring a VM from a saved state if the host screen size changed
• GUI: disabled SCROLL LED sync from HID LEDs synchronization (Mac OS X hosts only)
• Webcam passthrough improvements including GUI support (see the manual for more information)
• Guest Control: implemented more IGuestSession methods
• Guest Control: added support for deleting and renaming guest files + directories in VBoxManage
• Guest Control: various bugfixes
• API: incorrect handling of hardware UUID default value, resulting in an all zero DMI/SMBIOS UUID, which leads to Windows requesting re-activation (4.3 regression; bug #12244)
• 3D support: fixed crash on shutdown if 2D video acceleration is enabled (Mac OS X hosts only)
• 3D support: miscellaneous fixes
• Storage: fixed detection of CD/DVD media when switching from an empty to a host drive with passthrough enabled
• Storage: fixed hang of the VM process when the disk is full under certain circumstances
• NAT: listen for changes of NAT Network setting at runtime
• NAT: NAT Network DHCP server now saves leases to a persistent storage
• Main: monitor changes in host DNS configuration
• Mac OS X host: reworked a mechanism of adding a VM desktop alias from the VM selector
• Mac OS X installer: remove old kernel extensions during upgrade (bug #12258)
• Linux Additions: correctly set umask before installing (bug #12166)
• X11 Additions/3D: fix freezes starting 3D desktop (bug #11503, thank you Sam Spilsbury)
• X11 Additions/3D: fix depth buffer support (bug #11905)
• X11 Additions/3D: fix Age Of Empires 3 rendering (bug #11331)
• Windows Additions/3D: fix Google Earth plugin rendering
• Windows Additions/WDDM: autoresize fixes

VirtualBox 4.3.0 (released 2013-10-15)

This version is a major update. The following major new features were added:

• VMM: major rewrite of the VT-x code and the AMD-V code including many bug fixes and performance improvements (for example bug #9659)
• VMM: introduced a lightweight instruction interpreter for situations not handled by hardware virtualization
• GUI: extended messaging mechanism (new non-modal popup overlays used to show non-critical warnings and provide user with additional information)
• GUI: keyboard shortcuts management (input page of global preferences extended with possibility to edit general keyboard shortcuts for VirtualBox Manager and Virtual Machine)
• GUI: video capturing support (bug #4766)
• Added USB touch device emulation
• Added experimental support for webcam passthrough complementing USB passthrough (see the manual for more information)
• Added SCSI CD-ROM emulation, including boot support
• VRDP: support for IPv6
• Guest Control: guest sessions now are running in dedicated, impersonated session processes (needs at least Guest Additions 4.3 installed)
• Guest Control: implemented IGuestFile support
• NAT: experimental virtual router mode: several VMs are attached to the same internal network and share one NAT service (see the manual for more information)

In addition, the following items were fixed and/or added:

• VMM: significantly improved performance of NetWare 5.x/6.x guests on host systems without nested paging support
• VMM: fixed losing host NMIs while in VT-x guest-context
• VMM: changed order of actions in emulated task switch (bug #10532)
• VMM: allow to activate VT-x while in SMX mode and provide more information if that is not possible
• GUI: update check uses https
• GUI: numerous minor internal cleanups and bug fixes
• GUI: HID LEDs synchronization when switching between guest window(s) and host (Mac OS X hosts only)
• GUI, VBoxManage: when unregistering a VM, also unregister the hard disk images which are used exclusively (bug #10311)
• GUI: use the number of physical presented processor cores instead of the number of logical processor cores to check if the users assigned too many virtual CPUs to the guest
• Snapshots: made live snapshots work again (bug #9255)
• Teleportation: made it work again (bug #9455)
• Storage: implemented AHA-154x compatibility mode in the emulated BusLogic SCSI HBA
• Storage: significantly improved performance of large ATAPI PIO transfers (BeOS, Minix 3 guests affected)
• Storage: added floppy formatting emulation (NB: cannot be used to change existing media geometry)
• Settings: global and per-VM default frontend configuration, useful to select the use of alternative VM frontends
• Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance and may trigger crashes
• Settings: the per-VM hwvirtextexcl setting has been replaced by a global hwvirtexclusive property
• Main: new event queue implementation which does not use the host's native event queue for processing VirtualBox events anymore
• Main: eliminate the use of SysV semaphores on all host OSes other than Windows, namely Linux, Solaris and Mac OS X, with the consequence that no system reconfiguration is needed to run more than approximately 100 VMs
• Main: use the XDG standard configuration folder instead of .VirtualBox on systems where it is appropriate (bug #5099)
• Main: extension pack framework can now support loading HGCM modules, contributed by Jeff Westphal
• VBoxManage: list more information about hard disk/DVD/floppy media, and support the --long option to show really all available details
• VBoxManage: added support for optional command line parameters for the automatic Guest Additions update
• VBoxManage: added support for listing active guest sessions, guest processes and/or guest files via guestcontrol list <all|sessions|processes|files>
• VBoxManage: added support for closing active guest sessions via guestcontrol session close --session-id <ID> | --session-name <name or pattern> | --all
• VBoxManage: added support for terminating active guest processes via guestcontrol process kill|close|terminate --session-id <ID>| --session-name <name or pattern> <PID> ... <PID n> or guestcontrol [p[s]]kill --session-id <ID>| --session-name <name or pattern> <PID> ... <PID n>
• VBoxManage: added support for watching guest sessions via guestcontrol watch
• VBoxManage: added modifyvm --triplefaultreset to make the VM reset on triple fault instead of triggering a Guru Meditation (see the manual for more information)
• 3D support: several fixes
• 3D support: several fixes for Mac OS X hosts
• OVF: several fixes
• Extpack Installer: make it work if the file is located in a folder with special characters
• Keyboard: fix for reporting key sequences like Ctrl+Alt+Del for the USB keyboard emulation
• Shared Clipboard/X11: support for BMP-format images, contributed by François Revol
• Mac OS X hosts: limited support for Mac OS X 10.9 (Mavericks)
• Mac OS X hosts: use a launchd script instead of the deprecated StartupItem mechanism (bug #8940)
• Windows hosts: don't cause massive DPC latency (only on certain hosts; still needs improving; bug #6242)
• Windows hosts: consider symlinks when retrieving volume information (bug #11962)
• Windows hosts: fixed an issue with USB2 devices being inaccessible when plugged into USB 3.0 ports
• Windows Additions: fixed misbehavior with guest display power management (WDDM driver only; bug #11170)
• Windows Additions: fixed memory leak caused by WTSQuerySessionInformation() on Windows 2000 guests (bug #12072)
• Windows Additions: ability to track guest user idle times through the newly introduced event IGuestUserStateChangedEvent
• Linux Additions: fixed udev detection in the init script with Linux 3.x kernels