As I don't use a Mac, I can't provide any guidance on how to make your code work in that environment. Simply deleting 'On Error Resume Next' isn't going to help. I'd be inclined to insert:
On Error Goto 0
after:
Documents.Close SaveChanges:=wdPromptToSaveChanges
That might help identify where any relevant errors are occurring.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]