Reset Your Prefs
Press and hold Option+Command+Shift (Mac OS) as you start Illustrator. Your current settings are deleted
Run Disk Utility to repair permissions
Locarted in Applications >> Utilities >> Disk Utility
Try Booting Ilustrator with plug ins Disabled
Hold down shift while booting Illustrator
I have this trouble but mine was caused by importing old setting from cs5.5 - in this case actions.
I hope this may help someone
I just started having this issue as well, and it seems that running an action in CS6 crashes it. I just upgraded to CS6, and the actions are all imported from CS5.5.
What did you do to fix this? Thanks in advance for any feedback!