Error launching graphics driver on iMac

[SchroedersKater]

Hi all,

I try to run Windows 10 inside Virtual Box 6.1 on a 27" iMac with Catalina. All software is up to date. I always get the error mentioned in the title and the display does not resolute higher than 1600 which is unusable small on a 27" iMac. And the VM reacts very jerking on mouse movements, too.

I previously had the same error on my MacBook Pro. Increasing the Graphics memory to 256 MB solved the problem there. I thought, the origin of the problem may be similar on my iMac, but there is no way to increase the graphics memory above 256 MB.
Any idea appreciated. I'm pretty desperate.

[scottgus1]

Start the guest from full normal shutdown, not save-state. Run until you see the problem happen, then shut down the guest from within the guest OS if possible. If not possible, close the Virtualbox window for the guest with the Power Off option set.

Right-click the guest in the main Virtualbox window's guest list, choose Show Log. Save the far left tab's log, zip it, and post the zip file, using the forum's Upload Attachment tab.