Hi everybody !!
I had the exact same problem (PPro CS6 was crashing anytime i tried to quit). I don't know if my solution will work for everybody but it worked for me !!
The crashes started three weeks ago when i accidently open "Disk Drill" (HD manager,cleaner). At first i didn't make the conection because i tought i'd close "Disk Drill" right away. The thing is, "Disk Drill" wasn't close, it was on background operating...
Once i've notice that, I closed it (for good this time), and VOILA PPro stoped crashing.
So my solution is : close every HD manager, cleaner or any other software related to HD (that must be some kind of conflict in the autorisations).
Hope it will work for all of you or at least driving you to your own solution !
Edit : @rbtjonas : try to close Disk Warrior and others (in your case)
NaZa Giral