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

Search for 'GCC_INCREASE_PRECOMPILED_HEADER_SHARING' in build settings and change it to YES. - This worked for me.