Rendering path bug/error

Whenever I switch the project to deferred from forward rendering the rendering turns pink. Everything works in forward rendering, but in forward rendering any image effect I apply doesn’t seem to work anymore. (we’re using pro). For example Bloom only overlays the image with a solid color and doesn’t respond to threshold etc. as if the input is blank.

Even in a blank scene within the project, the same issues persist. If I start a new project everything works fine.

It’s a project that’s been around for a while and started somewhere in Unity 2. We have upgraded it to 3 (without issue) and now to 4 which is when these bugs started. My next plan is to go through a copy of the project and remove assets until it starts working again, but I was wondering if someone experienced the same issue before and could point me in the right direction?

Thanks!

Answer found… apparently there were some old image effect scripts hanging around in a folder that the unitypackage update didn’t spot so it didn’t update them. Hopefully this information is useful for someone else!