GearVR Blackscreen

So I am trying to deploy a project that had perfectly worked in the past to my S7.

It is a GearVR project. What happens is, the splash screen flashes up for like 1.5 seconds, then the screen stays black.
Other VR apps seem to work just fine.

I am kinda lost here, adb logcat doesn’t show anything suspicious, Unreal also packages without any problems.
Any ideas what I could check?