Changelog for VirtualBox 4.1

This page lists all changes of the VirtualBox 4.1 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 4.1.30 (released 2014-01-10)

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

• HGCM: fixed crashes under certain conditions
• Storage: fixed detection of CD/DVD media when switching from an empty to a host drive with passthrough enabled
• 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
• Linux Additions: correctly set umask before installing (bug #12166)
• Windows Additions: fixed guest crashes in in Shared Folders service under certain conditions
• Guest Additions / 3D: fix an occasional dead-lock (bug #12319)

VirtualBox 4.1.28 (released 2013-10-11)

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

• VMM: properly handle NMIs on Linux hosts with X2APIC enabled
• GUI: fixed a crash on shut-down
• GUI: prevent crashes under certain conditions on X11 hosts
• VRDP: fixed a rare crash on the guest screen resize
• Storage: fixed lost writes if iSCSI is used with snapshots and ansyc I/O (bug #11479)
• Storage: fixed hang when creating a snapshot using Parallels disk images (bug #9617)
• USB: fixed hang during isochronous transfer with certain devices (4.1 regression; Windows hosts only; bug #11839)
• Main/Properties: don't create a guest property for non-running VMs if the property does not exist and is about to be removed (bug #11765)
• Main/Properties: don't forget to make new guest properties persistent after the VM was terminated (bug #11719)
• Main/OVF: don't crash during import if the client forgot to call Appliance::interpret() (bug #10845)
• VBoxSVC: don't crash on systems with many VLAN interfaces
• Mac OS X installer: keep previously instlled Extension Packs on VirtualBox upgrade
• Linux Additions: Linux 3.12 compile fix (bug #12083)
• Linux hosts / guests: Linux 3.11 fixes (bugs #11946, #12001)
• Windows hosts: fixed an issue with USB2 devices being inaccessible when plugged into USB3 ports
• Linux Additions: fixed compilation against Linux 3.2.0 Ubuntu kernels (4.1.26 regression as a result of the Debian kernel build fix)
• Linux Additions: fixed udev detection in the init script with Linux 3.x kernels
• X11 Additions: support X.Org Server 1.14 (bug #11609)

VirtualBox 4.1.26 (released 2013-04-12)

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

• This is a maintenance release. The following items were fixed and/or added:
• Storage: fixed data corruption after resizing a VDI image under certain circumstances (bug #11344)
• Storage: fixed crash when connecting to certain QNAP iSCSI targets
• Bridged Networking: fixed TCP pseudo header checksum computation for IPv6 (bug #9380)
• Linux hosts / Bridged Networking: fixed the problem with leaking connections in conntrack (bug #11178)
• Audio: fixed broken ALSA & PulseAudio on some Linux hosts due to invalid symbol resolution (bug #11615)
• VBoxManage: don't crash during screenshotpng if there is no display (bug #11363)
• VBoxHeadless: don't filter guest property events as this would affect all clients (bug #11644)
• Linux hosts: work around gcc bug 55940 which might lead to wrong kernel module code if gcc 4.7 is used to compile the 32-bit Linux host kernel (bug #11035)
• Linux hosts: made "]" key work again on Japanese keyboards.
• Solaris / Mac OS X hosts: VM CPU load metrics now report 100% when all cores are fully utilized (used to be a single core)
• Linux hosts / guests: fixed shared folders driver build error on 3.5 and newer kernels when CONFIG_UIDGID_STRICT_TYPE_CHECKS option is enabled.
• Linux Additions: Linux 3.8 / 3.9 compile fixes (bug #11036)
• Linux Additions: handle fall-back to VESA driver on RedHat-based guests if vboxvideo cannot be loaded
• Linux Additions: fixed two warnings in the shared folders guest kernel module (bug #11390)
• Linux Additions: fixed shared folders NLS translation. Currently, CONFIG_NLS_DEFAULT table is used by default, however it might be overridden by *iocharset* mount option.
• Linux Additions: RHEL/OEL/CentOS 6.4 compile fix (bug #11586)
• Linux Additions: Debian Linux kernel 3.2.0-4 (3.2.39) compile fix (bug #11634)
• X11 Additions: fixed an unresolved reference in vboxvideo_drv for X.org 6.8 guests and before (e.g. RHEL4; 4.1.24 regression)
• X11 Additions: fixed screen automatic resizing for guests with X.org 1.3 or older (4.2.0 regression)

VirtualBox 4.1.24 (released 2012-12-19)

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

• VMM: adapted to changes in Mac OS X 10.8.2 (bug #10965)
• VMM: page fusion fixes
• GUI: disable proxy authentication for security reasons
• VRDP: fixed occasional crash during a video playback in the guest
• NAT: fixed a memory leak when disabling the NAT engine (bug #10801)
• NAT: fixed a crash under rare circumstances (Windows hosts only; bug #10128)
• Virtio-net: fixed the problem with network statistics counters in Session Information dialog (GUI)
• Storage: fixed a hang during VM reset under certain circumstances (bug #10898)
• Storage: fixed hang under rare circumstances
• Storage: fixed hang in case of unaligned requests and async I/O enabled
• Storage: fixed hang with newer VHD images (bug #11279)
• VGA: fix for double scan text modes
• VBoxManage: fixed a memory leak when executing and waiting for a guest process (bug 10859)
• VBoxManage: fixed converting disks from raw images
• BIOS: certain legacy guests (e.g. Windows 95) didn't find the boot device after a warm reboot
• BIOS: don't trash the palette in text modes when setting the border color
• USB: fixed invalid pending request count at the time of service of DEVICE POWER requests (Windows hosts only; bugs #10021, #11056)
• OVF: fixed importing OVF files cerated by recent VMware products (bug #10905)
• Linux hosts / guests: Linux 3.7-rc1 fixes
• Linux Additions: support X.Org Server 1.13
• Linux Additions: fixed a hang when the X server was restarted with old guest kernels
• Linux Additions: fixed a VBoxService crash during CPU hot remove (bug #10964)
• Windows Additions: fixed Guest screen automatic resize issue for NT4
• Windows Additions: fixed auto-logon installation for Windows 8
• Windows Additions: fixed Guest Additions startup on Windows 2000 guests
• Windows Additions: don't fail if the shared folders host service is not available

VirtualBox 4.1.22 (released 2012-09-07)

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

• VMM: fixed a potential host crash triggered by shutting down a VM when another VM was running (only affected 32-bit hosts and 64-bit OS X hosts, 4.1 regression, bug #9897)
• VMM: fixed a potential host crash under a high guest memory pressure (seen with Windows 8 guests)
• VMM: respect RAM preallocation while restoring saved state.
• VMM: fixed handling of task gates if VT-x/AMD-V is disabled
• Storage: fixed audio CD passthrough for certain media players
• USB: don't crash if a USB device is plugged or unplugged when saving or loading the VM state (SMP guests only)
• RTC: fixed a potential corruption of CMOS bank 1
• Mac OS X hosts: installer fixes for Leopard (4.1.20 regression)
• Windows Additions: fixed memory leak in VBoxTray (bug #10808)

VirtualBox 4.1.20 (released 2012-08-20)

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

• VMM: fixed a crash under rare circumstances for VMs running without hardware virtualization
• VMM: fixed a code analysis bug for certain displacement instructions for VMs running without hardware virtualization
• VMM: fixed an interpretion bug for TPR read instructions under rare conditions (AMD-V only)
• Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs #9604, #10491)
• VBoxSVC: be more tolerant against environment variables with strange encodings (bug #8780)
• VGA: fixed wrong access check which might cause a crash under certain conditions
• NAT: final fix for crashes under rare conditions (bug #10513)
• Virtio-net: fixed the problem with receiving of GSO packets in Windows XP guests causing packet loss in host-to-VM transfers
• HPET: several fixes (bugs #10170, #10306)
• Clipboard: disable the clipboard by default for new VMs
• BIOS: the PCI BIOS was not properly detected with the chipset type set to ICH9 (bugs #9301, #10327)
• Mac OS X hosts: adaptions to Mountain Lion
• Linux Installer: fixes for Gentoo Linux (bug #10642)
• Linux guests: fixed mouse integration on Fedora 17 guests (bug #2306)
• Linux Additions: compile fixes for RHEL/CentOS 6.3 (bug #10756)
• Linux Additions: compile fixes for Linux 3.5-rc1 and Linux 3.6-rc1 (bug #10709)
• Solaris host: fixed a guru meditation while allocating large pages (bug #10600)
• Solaris host: fixed possible kernel panics while freeing memory
• Solaris Installer: fixed missing icon for menu and desktop shortcuts

VirtualBox 4.1.18 (released 2012-06-20)

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

• VMM: fixed VERR_REM_VIRTUAL_CPU_ERROR under rare conditions after the guest has been reset (bug #5164 and others)
• VMM: fixed host freezes with 64-bit guests on 32-bit Linux hosts (bug #10528)
• VRDP: added a workaround for rdesktop clients not properly updating the screen size when minimized
• AHCI: fixed a rare bug which can cause a guest memory corruption after the guest storage controler has been reset
• NAT: another attempt to fix crashes under rare conditions (Windows hosts only; bug #10513)
• Mac OS X hosts: addressed issues running Leopard / Snow Leopard (bug #10631)
• Linux hosts / Bridged Networking: fixed the problem with device driver unloading on kernels 3.2.18 and newer due to an invalid reference counter (bug #10624)
• Linux hosts / guests: Linux 3.5-rc1 fixes
• Linux Additions: the guest content was sometimes not properly updated (bug #9887)
• Solaris Additions: installer fix for X.org Server 1.11 and 1.12

VirtualBox 4.1.16 (released 2012-05-22)

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

• VMM: fixed a Guru Meditation VERR_ACCESS_DENIED with certain guests (bugs #7589, #8247)
• VMM: fixed a Guru Meditation VERR_PAGE_TABLE_NOT_PRESENT with Ubuntu 32-bit guests with nested paging enabled on AMD CPUs (bug #10183)
• VMM: preserve segment limits and attributes when switching to unreal mode required for some legacy guests to work properly (VT-x without unrestricted guest execution only; bug #9941)
• VMM: fixed a VM hang after a resume from pause / savestate with SMP guests in rare cases
• 3D Support: several fixes for the Windows WDDM video driver crash
• NAT: fixed a crash on attempt to process ICMP datagram under some circumstances (bug #10527)
• Host-only Networking: lifted the maximal number of interfaces to 128 on Linux and Mac OS X hosts (there is no such limitation for Solaris and Windows hosts)
• EFI: fixed wrong SEC/PEI Core entry point calculation (bug #10531)
• VRDP: fixed a display update problem (bug #10503)
• Main: set the proper VM state if savestate failed for some reason (bug #6189)
• Main: more useful error message if a medium is inaccessible
• VBoxManage: fixed controlvm savestate if the VM is already paused
• Mac OS X hosts: addressed issues running on Mountain Lion Preview 3 (bug #10267)
• Linux hosts: Linux 3.4 compile fixes
• Linux hosts: fixed wrong help path in some rpm-based packages (bug #10418)
• Guest Additions: fixed handling of custom environment variables during VBoxManage guestcontrol execute (bug #10581)
• Windows Additions: fixed guest driver crash of VBoxSF in certain cases (4.1.10 regression, bug #10408)
• Windows Additions: don't load the WDDM driver if 3D support is not available for Windows 8 guests to keep the guest maintainable in that case (still better to miss some features than providing a blank screen)
• Solaris Additions: added support for X.org Server 1.11 and 1.12

VirtualBox 4.1.14 (released 2012-04-26)

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

• Network: fixed the problem with packets larger than MTU-4 when PCnet or PRO/1000 was bridged to certain types of adapters on OS X hosts (bug #3783)
• NAT: fixed a segfault under rare circumstances
• 3D Support: fixed Windows WDDM video driver crash for SMP guests (bugs #10200, #10331)
• Windows Guest Additions, VRDP: fixed occasional text corruption (bug #3001)

VirtualBox 4.1.12 (released 2012-04-02)

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

• VMM: fixed VERR_NOT_SUPPORTED and VERR_RAW_MODE_INVALID_SMP guru meditation due to an invalid reschedule to raw mode (bug #10370)
• VMM: fixed PDMCritSectLeave guru meditation under rare circumstances with SMP guests
• VMM: proper Math Fault handling with certain legacy guests (bug #9042)
• NAT: fixed a socket leak under certain conditions
• Storage: better sanity check against reading beyond end-of-file
• Audio: fixed a crash in the NUL audio backend (bug #10374; 4.1.10 regression)
• HGCM: fixed a crash during savestate under rare circumstances
• VBoxSVC: several locking fixes
• VBoxManage: return the correct error code if controlvm savestate failed (bug #10134)
• Guest Additions: VBoxService should not crash on exit (bug #10326; 4.1.10 regression)
• Windows Additions: set the correct time stamp when a file is closed (bug #6473)
• Windows Additions: better help if the DirectX backups are not properly installed
• Linux Additions: Linux 3.4-rc1 compile fixes

VirtualBox 4.1.10 (released 2012-03-13)

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

• GUI: if 3D support on the host is not available for some reason, do not only disable this VM setting but also uncheck the checkbox
• VMM: fixed a potential problem causing to schedule interrupts during SYSEXIT right after STI
• VMM: fixed a potential guest memory corruption issue with page fusion
• VMM: adjusted the module matching algorithm for page fusion a little, generally resulting in slightly more shared pages
• Main: host interfaces no longer have "defaults" for IP address and network mask attributes
• Main: don't depend on a password for certain guest control operations (bug #10030)
• 3D Support: fixed Windows XP hosts support (4.1.8 regression; bugs #10071 and #10088)
• 3D Support: rendering fixes for Linux hosts with NVIDIA graphics
• 3D Support: fixed saved state issues (4.1.8 regression; bug #10126)
• 3D Support: WDDM driver: fixed powershell_ise crashes (bug #10167), make WPF-based apps work with Aero enabled, fixed additional possible WinSAT crashes
• VRDP: fixed remote clipboard compatibility issues with some clients
• Storage: fixed a possible data corruption when compacting VDI or VHD images with snapshots (32-bit hosts only)
• iSCSI: fixed crash when using incorrect credentials when authenticating with a LIO target (bug #10173)
• Serial: don't abort in host mode under rare error conditions (non-Windows hosts only)
• SDK: actually ship current C bindings
• SDK: fixed the Java glue code for JDK 1.7.0 (bug #9848)
• SDK: added Python example
• Metrics: make metrics collection more robust regarding blocked VMs
• Web service: added SSL/TLS support
• VBoxShell: fixed Guest Additions information lookup
• Solaris installer: fixed dependency checking while installing VirtualBox in a zone
• Linux hosts/guests: Linux 3.3-rc1 compile fixes
• Solaris hosts: fixed debug kernel panics while opening module CTF data (bug #9651)
• Mac OS X hosts: fixed Python support on Lion
• Linux Additions: make 3D passthrough work on OL/RHEL 6.2 (bug #10010)
• Linux Additions: fixed missing implementation when copying shared folder data through kernel high memory (bug #9878)
• Linux Additions: make sure all data is written when closing a memory mapped file on a shared folder
• Linux Additions: added support for X.Org Server 1.12
• Solaris Additions: fixed guest kernel driver to load properly on guest reboot (4.1.8 regression; bug #10113)
• Solaris Additions: fixed missing 64-bit OpenGL library VBoxOGL.so (bug #10151)
• Solaris Additions: fixed VBoxService import and start for Solaris 11 guests.
• Windows Additions: some Windows 8 adaptions
• Windows Additions: several fixes for shared folders (bug #9753)
• Guest control: miscellaneous bugfixes

VirtualBox 4.1.8 (released 2011-12-19)

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

• VMM: fixed VERR_MAP_FAILED during savestate under certain circumstances (bug #7929)
• GUI: stop updating the VM status icons when the VM is paused (bug #8368)
• VBoxManage: fixed wrong return code after startvm (bug #9642)
• BIOS: fixed hang at launch of DOS applications generated by Clipper 5.3 (note that hardware virtualization may be required)
• USB: fixed OS/2 boot hang when using recent USB drivers
• NAT: increase maximum number of parallel connections making connections with port forwarding more robust (#8471)
• Metrics: fixed potential problem with invalid access in guest metrics collection upon VM destruction
• Main: don't crash if a medium is ejected twice (bug #9922)
• VBoxSVC: fixed crash under rare circumstances (e.g. client crash)
• VRDP: fixed screen freeze (bug #9620)
• OVF/OVA: fixed broken disk images on import under rare circumstances
• OVF/OVA: better error message when importing corrupted appliances
• VMDK/VHD: fixed a possible corruption with host cache disabled when using snapshots under rare circumstances (bug #9749)
• 3D Support: Fixed fullscreen mode issues for ATI graphics (bug #9775), Windows Media Player rendering for XPDM-based Direct3D support (bug #8341). Multiple fixes to XPDM and WDDM - based 3D support for Windows Guests and for 3D support in general
• Linux hosts: fixes for Fedoras Linux 2.6.41 (bug #9948)
• Linux hosts/guests: fixes for Linux 3.2 (bug #9743)
• Solaris Additions: various shared folder fixes (bugs #9856, #9862, #9917)
• Windows Additions: various fixes for Direct3D support (un)installation, added detection of missing or wrong Direct3D system files

VirtualBox 4.1.6 (released 2011-11-04)

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

• VRDP: fixed screen corruption
• NAT: the interface stopped working after a lot of failed ICMP requests (bug #9371)
• E1000: fixed rare Windows 7 guest hangs, either at boot time or when reconfiguring the network card in unusual setups (bug #6223)
• ATA: fixed a possible crash during ATAPI passthrough with certain guests
• ATA: improved compatibility with ancient Linux kernels
• Main: fixed incorrect framebuffer information after leaving the fullscreen mode with X11 guests, this lead to a scrambled preview window in the GUI for example
• Mac OS X hosts: fixed the problem with duplicate packets when bridged to a wireless interface (bug #9648)
• Linux hosts: fix for 3D support on Fedora 15 (bug #9799)
• Linux hosts: don't call del_timer_sync from an interrupt context (Fedora bug report 746331)
• Windows Vista and 7 guests: more WDDM fixes
• Linux Additions: fixed kernel module compilation failure on Redhat Enterprise Linux 4 (bug #9709)
• Linux Additions: install the DRI driver correctly on Ubuntu 11.10 guests
• Solaris Additions: added read-only mmap support for shared folders
• Solaris Additions: added directory, file mode and mask options for shared folders
• Windows Additions: implemented faster detection of logged-in guest users and stale sessions
• X.Org Additions: fixed graphical corruption when switching to a virtual terminal (bug #9490)

VirtualBox 4.1.4 (released 2011-10-03)

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

• VMM: fixed PAE guests running on 32-bit hosts (4.0 regression; bug #9458)
• VMM: fixed INVALID_PARAMETER guru meditation caused by insufficient memory conditions (4.1.0 regression; bug #9240)
• VMM: fixed clobbered CPU registers during stos/lods/ins/outs emulation under rare circumstances
• VMM: another fix for 64-bit guests on recent AMD CPUs
• GUI: warn the user if he uses an outdated extension pack and allow to download and upgrade in that case (bug #8025)
• GUI: fixed spurious LCtrl key events on some Windows hosts (4.0.6 regression; bug #373)
• VBoxManage: another fix for extpack install --replace (bug #9308)
• VBoxManage: allow to specify the UUID of the target image in convertfromraw
• VRDP: fixed a rare crash when two or more clients connect to the server (bug #9503)
• VRDP: fixed a case when a client was not resized correctly (bug #9242)
• USB: make device capturing work on Windows hosts with usbhub class filter drivers installed (bug #9298); bugfixes for Windows host USB support
• VHD: fixed reads crossing block boundaries (bug #8532)
• VMDK: fixed progress indicator when creating split VMDK images
• Floppy: fixed medium size detection for physical mediums (Windows hosts only)
• Main: fixed VM initialization if a shared folder does not exist (bug #7941)
• Main: fixed possible deadlock between hard disk enumeration and resetting of immutable disks (bug #9549)
• Main: fixed not detaching of virtual storage after a snapshot restore operation (bug #8296)
• Main: always reset modified state after restoring a snapshot (bug #9387)
• Main: fixed writing of changed VM settings to disk when using snapshots (bug #8932)
• Main: fixed taking screen shots (e.g. the preview window) for headless VMs if the Guest Additions are active
• Virtio-net: fixed the problem with UDP packets exceeding MTU (bug #9370)
• 3D Support: fixed incorrect rendering and possible crashes when switching to/from fullscreen with enabled 2D acceleration
• 3D Support: fixed Compiz under Ubuntu 9.10
• Guest control: Miscellaneous small bugfixes
• Linux / Solaris hosts: don't use hard links in packages (4.1.2 regression; bug #9441)
• Mac OS X hosts: fix installation issues when installed as root (bug #1578)
• Mac OS X hosts: fixed packet capture issues with vboxnetX host-only interfaces (bug #8076)
• Solaris hosts: fixed incoming multicast packets for Crossbow based bridged networking (bug #9532)
• Solaris hosts: fixed starting EFI guests due to missing EFI ROM files (bug #9535)
• Windows hosts installer: fixed ADDLOCAL usage on command line (4.1.0 regression; bug #9488)
• Windows hosts installer: fixed dangling shortcut to the .chm help file (bug #9646)
• Windows hosts installer: try to fix installation error 2869 which appeared under certain circumstances (bug #9664)
• Windows hosts: VBoxHeadless should never open a separate console window (bug #3549)
• Guest Additions: fixed hang while waiting for guest execution output (4.1.2 regression; bug #9446)
• Linux Additions: add support for X.Org Server 1.11 (bug #9519)
• Linux Additions: suppress an incorrect error message and allow a shared folder to be mounted in multiple places (bug #9627)
• Linux Additions: start VBoxService correctly on openSUSE 12.1 (bug #6229)
• Linux Additions: properly finish the installation even if the compilation of the DRM module fails (which is not fatal)
• Solaris Additions: fixed memory leaks and panics while mounting (from console) and unmounting shared folders.
• Windows Additions: fixed swapped mouse cursor hotspot coordinates (4.1.0 regression; bug #9447)
• Windows Additions: fixed PAGE_FAULT_IN_NONPAGED_AREA BSOD in VBoxDisp.dll when running SnippingTool (bug #9508)
• Windows Additions: make image viewer work correctly with Aero enabled (Vista and Windows 7)
• Windows Additions: fixed incorrect window border blurs under Aero with ATI cards (Vista and Windows 7)
• Windows Additions: fixed incorrect rendering when moving 3D applications outside guest desktop and back under Aero (Vista and Windows 7)
• Windows Additions: fixed guest hangs when switching back from fullscreen text mode apps (bug #9636)

VirtualBox 4.1.2 (released 2011-08-15)

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

• VMM: fixed 64-bit guests on AMD Fusion CPUs (bug #8824)
• VMM: fixed handling of the sysenter/sysexit machine instructions in 64-bit guests on Intel hosts
• GUI: added linked clone support
• GUI: fixed error check when changing the VM controller settings (4.1.0 regression; bug #9246)
• GUI: fixed the inclusion of additional information (license, vendor, ...) on OVF export
• GUI: when taking a snapshot from the VM selector, don't do a live snapshot
• GUI: fixed immediate crash during start on certain environments due to a library version conflict
• Guest control execution: implemented copying single files from guest to the host (directories and filters not supported yet)
• Guest control execution: limited to serve up to 5 guest processes at a time by default
• Main: return the correct RDP default port fixing settings warnings in the GUI if the remote display was enabled at runtime (bug #9368)
• VBoxSVC: made the path comparison OS independent when images are registered (bug #9303)
• VBoxSVC: several fixes/performance improvements for cloning of VMs
• Snapshots: fixed "Solid-State drive" flag survival on snapshot creation (bug #9379)
• VBoxManage: implemented copyfrom and stat guest control tools to copy files from guest to host and to check for existence of files on the guest
• VBoxManage: fixed extpack install --replace (bug #9308)
• VBoxManage: allow to start multiple VMs with startvm
• VBoxManage: experimental support for SATA CD/DVD hotplugging
• Mouse support: fixed an off-by-one pointer position error affecting Windows guests (bugs #7566, #9321)
• VRDP: fixed a case when the screen was not redrawn correctly (bug #9242)
• NAT: changed TCP connection establishment according to Winsock API requirements (Windows hosts only; bug #8919)
• USB: fixed device recognition issues (bugs #9299) and fixed several device capturing issues (Windows hosts; bug #9299)
• USB: fixed issues with remote filters being applied to local USB devices
• OVA: fixed import of renamed OVA files (bug #9033)
• Windows host: fixed icon for .VDI files (bug #9393)
• Solaris hosts: fixed a bug preventing parallel usage of multiple host NICs with Crossbow based bridged networking
• Linux hosts: fixed random kernel panics on host suspend / shutdown (4.1.0 regression; bug #9305)
• Guest Additions: keep logged in user count in out-of-memory situations and warn about it
• Solaris Additions: fixed shared folders due to missing symbols in the vboxfs module (4.0.12 / 4.1.0 regression; bug #9264)
• Windows Additions: fixed file truncation on a shared folder with some applications (bugs #9276, #9315)
• Windows Additions: fixed shared folder issues with antivirus software and 64 bit Windows guests (bug #9318)
• Windows Vista and 7 guests: WDDM driver fixes and performance enhancements, fixed WinSAT crashes (#9267)
• Linux Additions: fixed llseek() for Linux kernels 2.6.37 and above

VirtualBox 4.1.0 (released 2011-07-19)

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

• Support for cloning of VMs (bug #5853, see the manual for more information): full clones can be created through the GUI and VBoxManage, linked clones only through VBoxManage
• GUI: enhanced wizard for creating new virtual disks
• GUI: new wizard for copying virtual disks
• GUI: keep the aspect ratio in scale mode (Windows and OSX hosts only; bug #7822)
• VMM: raised the memory limit for 64-bit hosts to 1TB
• Experimental support for PCI passthrough for Linux hosts, see the manual for more information
• Windows guests: Experimental WDDM graphics driver, supporting Windows Aero (bug #4607) and providing Direct3D support using a cleaner approach (no need to install the guest drivers in Safe Mode anymore)
• Guest Additions: status of modules and features can now be queried separately by the frontends
• Networking: new network attachment mode "Generic Driver", which offers an open plugin architecture for arbitrary and separately distributable virtual network implementations
• Host-only Networking: fixed host crash in kernels prior to 2.6.29
• New Networking Mode UDP Tunnel: allows to interconnect VMs running on different hosts easily and transparently, see the manual for more information
• Experimental support for SATA hard disk hotplugging available with VBoxManage
• Solaris hosts: New Crossbow based bridged networking driver for Solaris 11 build 159 and above

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

• VMM: more SMP timer fixes
• VMM: fixed sporadic recompiler crashes with SMP guests
• VMM: many small fixes
• GUI: when reverting to a snapshot, ask for taking a snapshot of the current state
• GUI: added a View menu
• GUI: added a setting for the promiscuous mode policy for internal networks, bridged networks and host-only networks
• GUI: added slider for setting the CPU execution cap allowing to limit the amount of CPU time spent for the execution of the guest, see the manual for more information.
• GUI: the VM description is editable during the runtime of a VM (bug #1551)
• GUI: added proxy settings (bug #2870)
• GUI: made the number of SATA ports configurable
• GUI: decrease time before showing the VM configuration dialog
• VBoxManage: more convenient configuration of storage controller attachments by automatically determining the port or device parameter when a storage controller has only one port or device per port
• VBoxManage: changed syntax of the guestcontrol command group, fixed various bugs, removed obsolete options
• VBoxBalloonCtrl: new service for automatic dynamic adjustment of the balloon size for running VMs
• Settings: machine names and snapshot names are not allowed to be a valid UUID
• Settings: provide better diagnostics if a single medium is used twice in a VM configuration
• Settings: provide better diagnostics for errors in medium create/merge/clone operations, and fix memory leaks in error cases
• Storage: ATA/SATA drives can be marked as non-rotational, i.e. the guest OS will detect them as a SSD if supported, which can improve performance
• Storage: virtual CD/DVD images will be detached if the guest ejects the medium, unless the drive is marked to handle ejects only on a temporary basis
• Storage: the medium UUID can be changed again when attaching a medium for the first time, which allows using images which are exact duplicates including the UUID
• Storage: fixed possible data corruption under certain circumstances with VHD and Parallels images (bug #9150)
• Storage: fixed unnecessary expansion when cloning differential images in VDI format
• Storage: fixed detection code to handle empty files for VDI and VMDK format
• Storage: fixed access to CD/DVD images beyond 4GB when using the SATA controller (bug #8592)
• Floppy: several bugs have been fixed
• Floppy: make it possible to unmount a host floppy disk (bug #6651)
• BIOS: disk-related structures are now checksummed correctly (bug #8739)
• USB: many fixes for the Windows USB host driver
• NAT: reduced memory footprint
• Networking: fixed the problem with segmentation offloading when several VMs are transmitting in parallel
• Networking: workaround for a bug in wireshark when operating directly on a capture file created by VirtualBox
• Serial: announce the serial devices in the ACPI tables to make Windows guests find the virtual hardware (bug #7411)
• VRDP: support for TLS connections (see the manual for more information)
• VRDP: support for multimonitor client configurations with MS RDP clients
• VRDP: fixed a rare screen corruption
• 3D support: fixed GL_VERSION string for different locales (bug #8916)
• Webservice: fixed timeout handling with HTTP 1.1 keepalive, and be more robust when connections fail
• VBoxSVC: fixed regression when several clients trigger autostart simultaneously
• Main: fixed incorrect handling of the medium location for media which are not file based (e.g. iSCSI), which resulted in confusing location values in many places
• JAX-WS client bindings: fixed resource leak
• Sources: fixed USB 2.0 support using extension packs for non-official builds
• Mac OS X hosts: fixed non-VT-x mode on Lion hosts
• Windows hosts: fixed copy'n'paste in the GUI and for the VM window (bug #4491)
• Windows hosts (64-bit only): enabled removing of all mediums when removing a VM
• Windows hosts (64-bit only): enabled live snapshot deletion
• Windows hosts: use native controls in the installer (bug #5520)
• Solaris hosts: fixed preemption issue with Solaris 11 hosts (builds 166 and above)
• Solaris hosts: better control of USB device access on Solaris 11 hosts
• Guest Additions: improved driver installation on Windows guests
• Guest Additions: fixed high CPU usage while executing guest programs from the host
• Solaris Additions: fixed automounting of shared folders (bug #8014)