I am also having some problems with X2a x64 running in Win 7 Pro...
Crashes that never happened in X1d...
It's making me a little nervous when I am working and saving files and I don't like that feeling...
Everything on the system is 100% stable except for X2a :(
I have sent some crash dumps to the mechanics,so hopefully they can analyze them and get some fixes happening....
But like some others around here,I'm thinking of heading back to X1d until these issues are resolved...
I really like X2 but I need a DAW that is 100% stable because my life depends on it....