HI!
I'm running FM 10.9 Personal on my brand new (but not super-duper) Win7 Professional 64-bit machine. FM 10.9 runs fine.
I decided to download a trial copy of FM 12.8 Personal, since it has a new feature which interests me, and faster report displays would be nice.
12.8 was indeed much faster, and essentially ran very well. However, pretty frequently - several times a day (and I don't sit and watch my investments for hours at a time) - a message box from Windows would pop up saying something like "Windows Explorer has stopped working. Windows is restarting." There seemed to be no real damage; something - I don't remember if it's the whole screen - then seems to very quickly redraw itself and everything is fine until next time.
I thought that this might interest Mark since it's a brand new machine, Avira running a little stronger than default finds no infections on it, and so far it has happened ONLY with FM 12, no other software, while 10.9 works fine with identical parameters.
Thanks.
David.