Graphical Glitch on Virtualbox Window Maximization

[SloanUser]

Hello,

I am running Ubuntu Linux 18.04 LTS with all the latest patches installed.

Linux xxxxxxx 4.15.0-33-generic #36-Ubuntu SMP Wed Aug 15 16:00:05 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I installed Virtualbox/Extension Pack/Guest Additions from virtualbox.org; version 5.2.18 r124319 (Qt5 9.5)

My machine has two monitors (1 VGA; 1 DVI).

I run both Windows XP and Windows 7 as guests, with one running on each screen.

If I minimize either VM via the virtualbox control bar I am correctly shown the Linux desktop. However, when I try to restore/maximize the VM by choosing it from the Linux taskbar, the VM desktop is restored with significant graphical glitches. I am forced to CTRL-F twice to take the VM out of fullscreen mode/restore fullscreen mode to correct it. This is completely reproducible and happens 100% of the time, independent of guest OS.

I have attached the following pictures (VM icons deleted to protect privacy):

1. Dual Screen Linux Desktop
2. Both VMs running
3. One VM Minimized
4. VM Restored with graphical glitch

I have also attached the log from the VM that was minimized/maximized from right after picture 4 was taken.

I purchased a Virtualbox Enterprise license on CDW so that this ticket may receive priority attention since I am a paying customer. Please feel free to call me via the information on my account if you need any confirmation of the CDW purchase.

Thank you in advance.

[Michael Thayer]

Unfortunately we can't give you higher priority than other users unless you contact Oracle support via the official channels<1> and they decide that we should do that. As engineers we do not have access to customer contract data unless that data is provided to us because we specifically need it. Of course, we will still give this bug the attention we give other bugs even without that, that is, as much as our resources allow.

1. ​https://support.oracle.com