@ken-martin thanks for the input.
I’m already using the latest versions I could find (SteamVR 1.20.4 , latest OpenVR SDK 1.16.8 from GitHub - ValveSoftware/openvr: OpenVR SDK).
Also, I’m using both VTK versions on the same PC with exactly the same OpenVR/SteamVR versions.
To me this would suggest that I need to do something differently in my application in setting up VR in VTK between the versions, but I have no clue yet what…
The Frustum OpenVR example also fails with exactly the same problem with 9.1.0; to me this seems to suggest rather something wrong on the system or with the combination of VTK/OpenVR and my hardware in general (AMD card / Oculus Quest).
However I think I also tried the same on a system with a NVIDIA Quadro and a HTC Vive - which would suggest that either my code as well as the the example are broken on VTK 9.1.0 and require some extra work to get going in comparison to VTK 9.0.1 - considering the line before where it crashes - it has to do with finding the manifest.json file , will check that next