Adobe CS6 hangs on 'continue'

Hi I'm using Adobe CS6 on an iMac. Even if I save all my sessions and files properly before I shut the programme down, when I open it up again, it still says "a session closed unexpectedly". It then offers the usual 'delete' 'cancel' 'continue' options. If I opt for 'continue', it tries to continue to open the programme but then just hangs. The only way I can get back into the programme is going for 'cancel'. All my saved sessions and files etc are still there - so it's mainly an inconvenience, but surely it shouldn't be happening?  I've searched the forums and someone was having this problem with CS5 but that was after they'd closed without saving - in which case I can see why the 'unexpectedly closed' message would come up. It still comes up for me if I've saved and closed everything before shutting down.

Also, very occasionally, the programme just crashes for no reason that I can see. Which also shouldn't be happening. Any thoughts/

Jayne