Does VR editor mode work for you at all? Since preview 4 my screen just goes black when trying editor in VR mdoe
EDIT:
I also had disabled instanced stereo due to translucent objects visible only in one eye(set it up like this in preview 3)
Now I re-enabled instanced stereo for the project in preview 4 to see if anything changed but now the project won’t even start, giving me this nice fatal error 
using rift S, rtx2070 and ryzen 2700