FX Stack AO Problem.

When ambient occlusion is enabled, it looks as expected in the editor viewport, but looks like this in the game mode: (as if it is not being properly blended, and, to use photoshop language set to ‘normal’ rather than ‘multiply’) Obviously I would like to see the rest of my scene! (sorry if it this is obvious, total n00b coming from Unreal 4)

Most likely you have MSAA enabled and you’re working with the Forward rendering path. This is currently broken in Unity 5.5 (fixed in 5.6). See the list of known issues.

Yup, that did it - as soon as I killed the default AA in the project settings, the postprocess AO blended as expected. Thanks.