I was having weird graphical glitches on my guest Windows 10 running in VirtualBox 6.1.18 on an Ubuntu 20.04 host. Some of the glitches I was seeing were multiple cursors in Photoshop cs6, some menu's needed minimized to see items I checked, show checked (refresh), and some transparency problems (again tied to a screen refresh). None of these broke the system or caused crashes but were annoying, especially the Photoshop multiple cursor thing.
I noticed that I did NOT have ENABLE 3D ACCELERATION checked on my Virtualbox host. I figured that this might be causing my problems so I checked it.
The multiple cursors magically went away but my transparency and screen refresh problems multiplied exponentially. Just to use the virtual, I went into my Windows 10 (guest) then to SETTING and turned off TRANSPARENCY EFFECTS in the Windows 10 guest(see screen shot below). Once I did that everything worked flawlessly.
I've decided that I do not need or even want the transparency effects in Windows 10. And by Enabling 3D Acceleration on my VirtualBox host for the Windows 10 guest, some programs that had some 3d effects disable are now working. Win! Win! (minus Windows 10 transparency)
