Issue with code autocompletion / syntax highlighting in Xcode 4.x

Question

I am having a rather strange issue in Xcode on one of my projects.

When I start to write my code, I am used to the auto-completion suggesting numerous entries for me

Answer 1

What the hell was that? I was not receiving any File not found error from the compiler. Fixed that one by removing some missing file links from UnitTest and UITestTarget from Compiler Sources on Project's Build Phases.