Maybe next time unhide your objects?
Works for me, assuming I'm pressing the right buttons. Maybe you compact/repaired the db before you zipped it and that fixed it. If you c/r'd it, check your file again. If still buggy I would suggest a decompile but it seems you have no code in there (using embedded macros instead) so I don't see that helping. In that case I'd suggest creating a new db and importing all objects into it to see if that fixes it.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.