Steps to reproduce:
1. Download and open attached project "OffscreenRenderIssue.zip"
2. Open scene "test"
3. Turn VR Mode on in player settings and select appropriate platform in API list
4. Play scene

Actual result: You will see two alternating images, switching once per second.
First - Normal camera
Second - Offscreen camera, with identical properties for the first one
On 5.4 with Oculus, you can see stretched screen when displaying the offscreen camera
On Vive (regardless of version) you can see doubled image (wrong offset for each eye).

Expected: Sharp, normal view

Tested and reproduced on:
Windows 10
Vive: Unity 5.4.0f2, 5.5.0a4
Oculus: Unity 5.4.0f3

Does not reproduce on:
Oculus: Unity 5.5.0a4