Adrian Wanner

Thanks, that was indeed the issue. I forgot to switch on 3D acceleration support. (for your reference: https://www.howtogeek.com/124479/how-to-enable-3d-acceleration-and-use-windows-aero-in-virtualbox/)

I installed the necessary GuestAddition and switched on 3D acceleration support in the VM (which is apparently still experimental, see https://www.virtualbox.org/manual/ch14.html and https://www.virtualbox.org/manual/ch04.html#ftn.idm2226 for more information). I am now able...

In general, OpenGL support is apparently experimental in virtual boxes. For various reasons it would be great to be able to run KNOSSOS on virtual (windows) machines, but so far...

I just tested VMWare (Windows 10, host: Ubuntu 14.04, 3D acceleration enabled): Knossos runs with OpenGL hardware acceleration without crashing, but the viewports do not update, unless I minimize/maximize KNOSSOS....