My FTM 2012 will not create a GedCom

Forget the sync-ing problems--I've given up hope of ever resolving those! But in order to keep my WorldConnect Project online tree current, I must update it periodically (which is very easy, but requires a new GedCom file each time).

For several weeks now, when I attempt to create a GedCom, my FTM program starts the creation process, then suddenly stops and closes the entire FTM program after only a few seconds.

I've tried compacting before attempting to create a GedCom (which I CAN do successfuly) and several other suggestions from various other forums, without success. How can I get FTM 2012 to successfully create a GedCom file again? Or am I stuck with never being able to sync with my Ancestry Member Tree AND never being able to share my data again through GedCom?

Thanks for any useful suggestions!