Perhaps also interesting:
As soon as I want to start the VorpX Desktop Viewer, the Mixed Reality Portal starts as expected. I can also catch a glimpse of the Dekstop. However, as soon as I move my head under the VR Device or press a Keyboard or mouse button, I only see a kind of loading screen on which several “balls” move. Endless….
I’ll start some other games and create the support log. Thanks a lot for your help!!! :)