XCode frequently seems to lose it's mind, and doesn't color code system classes or provide correct "code sense" suggestions. This is endlessly frustrating. The question has been asked on at least three other occasions:

http://stackoverflow.com/questions/2263994/problems-with-xcode-syntax-highlighting

http://stackoverflow.com/questions/1627033/xcode-code-sense-color-completion-not-working

http://stackoverflow.com/questions/2138047/xcode-code-loses-syntax-coloring

I have switched by project version to/from 3.1-compatiable and 3.2-compatiable, completely restarting XCode before and after each change with no effect.

I have rebuilt the code sense indexes and completely restarted XCode with no change.

I have built my project to make sure there are no errors and restarted.

I have copied my files (sans .svn files) to a different location - same problem.

I've already completely disabled the argument "placeholders" because they screw up my documents when i type too fast... all I'm asking for is for the "esc" key to display the correct list of properties and methods.