Was it Ac that crashed, or the entire OS?
try trashing your AC caches, located in your username/library/caches folder. just dump the whole Graphisoft folder and start the program fresh.
I haven't used that mouse yet, or on an intel machine. There may be caches for the mouse driver too.
let us know if that fixes it, since I have some people here in the office who use that mouse, too.
Wes