I have built my VR project out, but whenever I open the game it just shows black screen and closes. It works fine in the editor. In my level blueprint I have set console command to “Stereo On” which always worked in 4.11. Has there been made some changes to that on 4.12?
It does the same for a new project with only starter content 
However after trying to open it a couple of times it may randomly loadlink text.
Hello ,
I was able to reproduce this issue on our end. I have written up a report (UE-31719) and I have submitted it to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.
Make it a great day
More discussion here:
You can get it to work by executing with -vr, or typing “stereo on” into the console while playing.