Where are you seeing this message, that you included in your post:
".I had a message letting me know of the descrepency when i tried to sunc through ftm"
Where you working in your AMT or in FTM2012 when you changed the Place Name?
Where are you seeing "Family Tree Maker is Updating This Tree The tree "December 2011 full family", in your AMT or within FTM2012?
Where are you seeing "please compact your file and try to sync"?
You are seeing messages, but you are not saying where you hem seeing them.