I found out the hard way. Went from Vista 64 back to xp 32. All my problems went away, after 2 more days of work. I don't see any difference in speed between the two, in fact, it almost seems that xp is running a bit faster, even with the 4gig xp memory limitation. I do know for sure that TCv14 is running better, no more glitches, and is saving files faster in 2d.
I have 3 great looking kids, thank God my wife cheats on me.
Using V15.2, Windows 7 Home Edition 64bit