4.8.1 Stereo mode not working?

Hi
I just migrated my 4.7 project to 4.8.1. Now when I play a standalone game or VR preview I have no HMD view and just a window on the screen with a single thin window. If I Alt-Enter for stereo mode It just opens up another single view.
Anyone experienced this and found a solution?

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it’s just buggy (workaround included): VR Preview not working when Blueprint is open - XR Development - Unreal Engine Forums