Repro steps:

1. Open provided projects "StencilBlitProblem" Scene
2. See that the Game view is black
3. Click on "Main Camera" in the hierarchy window
4. In the Inspectors window uncheck "Banding FX (script)"
5. Look at the Game view

Expected result: for the Game view to not be black when the script is enabled
Actual result: The Game view is black once the script is enabled.

Reproduced with: 2017.1.0b3, 2017.1.0b2, 2017.1.0b1, 2017.1.0a6, 5.6.0p3, 5.6.0p2, 5.6.0p1, 5.6.0f3
Regression introduced in: 5.5.3p2
Did not reproduce on: 5.5.3p1 ,5.5.3f1 ,5.5.2f1 ,5.5.1f1, 5.4.5p1

Note:
Added a video
The error happens inside of "BandingGlitch" and "CameraFilterPack_TV_BandingGlitch" shader files at lines 21 - 25