Same here, bought a new computer thinking that I needed more RAM and faster processor to resolve the problem -- no such luck. In fact it hangs up worse on the new machine than it did on the old one.
Now FTM2012 shuts itself down so frequently that I can't use the sync feature at all because it looses the link and I have to re-download from Ancestry. The last time, I lost almost 10 hours worth of work that I did in FTM to clean up locations and sources.
I finally had to go back to working exclusively from the Ancestry.com site and will have to wait until they fix the issues with FTM.