I got the same Problem:
I have set everything up. Got my VR_Character and Game Mode.
Set everything correctly.
Got Instanced Stereo on and the execute console command “Stereo on” in my Game Mode on Event Begin Play.
I have nothing in my Scene, but my Character and a Cube to walk on.
I pack it and when executing the Exe, I just see a black Screen, but my BOunds grid is still showing.
Can soneone please help me?
Or have you already found an answer?