The problem is solved for me with UE4.13.0 and the vr project template (details see here). I would recommend to start a new vr project with the settings ‘Mobile / Tablet’ and ‘Scalable 3D or 2D’ and start changing settings from there.
I have installed:
- SteamVR 1473196558 (latest update but no beta)
- Windows 10 (all updates but no insider program)
- NVIDIA drivers 372.54 (not updated to the latest ones yet)