Don't know what happened to my response to this message. But, it's gone.
First, set the SyncNow to Manual (for now)
When you say "No progress (guess tht is what I men by "get stuck.") It is now 35 minutes later--no progress. I go into Ancestry but a screen tells me the tree isn't available because a synch is in progress.", as Long as those two bars are on the screen, is that FTM2012 is doing a Sync to your AMT. When you went to your AMT, it says "sync is in progress". I am guessing it's really Progress.
How many People are in your File AND how many Media files are associated in that file?