Post-processing Stack moving from Render-texture to normal stopped working

I'm using the built-in pipeline and the latest Post-processing Stack, I was using a camera that was rendering to a texture and post-processing was working fine. But when I tried to render normally (without the RTT) and Post-Process stopped working all together.

Weirdly enough, they work on the Scene View Tab, but not in the Game View Tab.
Also more strangely, if I fiddle with the MSAA in the Camera settings at runtime (if by default it is "Use Graphic Setting" change it to "Off", or viceversa) then Ambient Occlusion gets activated !?

I have tried to delete the camera and create a new one, to activate HDR settings in Graphics On/Off, to activate/deactivate every single post process effect in the camera but nothing worked.

I cannot get it to work on the Game View Tab (other than Ambient Occlusion when I fiddle with the MSAA settings).

What am I doing wrong?