Hello,
When I launch UE4 with the -dx12 flag, and enter VR Preview in my project, I get a black flickering in both eyes. The entire screen doesn’t flicker, but rather it looks like it’s trying to partially render something. I’ve made a video of what I mean - first showing the right eye, then the left.
This does not occur when I launch the editor without the -dx12 flag. However, I would prefer to run with that flag, since the UI elements of UE4 (menus, properties, etc) have much better performance with this flag on.
My system:
Windows 10 Pro
UE4 4.18
Intel 3970k
16GB DDR3
GTX 1080