hi.just get my oculus cv1 and set it up .its working with its app great but would like to test it on my project in ue4.11 or 4.13 . as i know the plugins are set but vr preview button is gray .
how may i get my project on oculus ?
thanks a lot
I have the same problem too. 
Be sure that the Occulus main application is still running while using the Rift with UE4. Also check that “Third Party Software” are allowed in Occulus application settings. Finally, ensure the Occulus Rift plugin in UE4 is turned on.