Yeah what's going on here with this? Got the same problem myself, OBS records and streams fine but soon as the Oculus App is even opened it's game over for OBS working if the NVENC encoder is used.
Which is a real shame as it's the only one that provides almost no performance hit. Given I'm new to the Rift I can only go on what I've read in other forums but this never used to be an issue, so what gives guys as it's clearly something caused by your update as OBS hasn't been changed.
Wow just tried recording using a different encoder, it was absolutely horrid frame rates dropping to 40 at times. Never really been a member of the frame rate police before, but damn it's needed for VR! It felt like someone was slamming on the brakes when the frame rates dropped, completed a race without feeling sick. But the sooner this is fixed the better because I can't be doing that again!