Just a guess, but open the VBA editor (ALT+F11), and check 'Tools, References' to see if there are any broken references.
If not, refresh references anyhow. Make a note of all the checked references, then uncheck one, close the dialog, try and compile (it may fail), then go back and recheck the reference (it will have scooted back down the list so you'll have to hunt for it). Do them all.
If that fails, then I don't have a clue. Search Google Groups to see if anyone else anywhere has ever had the same problem.