I posted this in answerhub already but received no response. Hopefully someone here can help as I’m out of options.
Starting yesterday (2/23/2018) whenever I launch UE4 (4.18.3), the SteamVR window displays in red “(unresponsive) UE4Editor.exe”.
If I try to run my level in VR Preview the VIVE only displays a default SteamVR loading environment with UE logo and loading animation. However, the mirrored display on the monitor appears to show the VIVE tracking and functioning normally. This also occurs in a blank project in 4.17 and 4.14.
Sometimes, while in VR Preview, if I wait a random amount of time or type tilde to enter a console command, the SteamVR window “unresponsive” message will disappear and the HMD operates normally. However, once I exit VR Preview and try it again, UE4 falls back into the “unresponsive” state.
If I run a packaged project from 4.18.3, the HMD works as expected every time.
The VIVE also works as expected in Unity and all SteamVR apps I have tried so far.
Console commands like “vr.bEnableStereo True” etc. seem to have no effect.
Windows 10 (version 1709)
GeForce 970 (188.8.131.52.2c)
HTC VIVE Pre
Any thoughts for how to troubleshoot this would be much appreciated. I really can’t understand why the VIVE works as expected everywhere but the Unreal Engine editor.