VR runtime not recognized

Hello there,

I am using Version 1.15.0 right now.

I have trouble starting Substance 3D Modeler in VR Mode, the refresh symbol doesn't even show and it tells me it doesnt recognize VR. I use the Pico 4 with Virtual Desktop and up until a few days ago it worked without problems. Since then I had a few errors which made me reinstall Modeler and update Virtual Desktop both on the Pico and on my PC. I feel like it has to do with steam VR not starting when i start Adobe Substance 3D Modeler like it used to before, but when i run Steam VR i only get to the Home Screen from that application. Starting Modeler when Steam VR is already running also doesn't work. In VD I tried setting OpenXR Runtime to both SteamVR and VDXR, but it didn't fix the issue. I attached my last log file from the error report. 
Thanks in advance!

Mona