Fixing Code Hinting
If code hinting does not work in your Flash CS5.5 AS editor, then check the bottom right corner of the editor. If you see a small triangle with an exclamation mark, roll over it. You will see this message:
"Unable to build code hint cache. Please save the associated FLA into a different folder. There are too many files on the classpath."
Hmmm… It seems that there are too many files in your class path.