I've seen similar questions, but haven't been able to solve this. Apparently randomly, Illustrator crashes when I try to save a file that I last edited several days ago. It consistently crashes on the same file (so trying again never helps), but it doesn't seem that every file is affected. I'm running cs6 on windows 7. I've tried resetting my profile and deleting temporary files (disk cleanup) to no avail. Any thoughts? I'm also not sure where to look for a crash log. Thanks!
Found a solution that fixed my problem:
Somehow the permissions to the illustrator prefs folder permissions had been changed to "Read only". Unchecking the "Read only" checkbox made Illustrator capable of saving files again without crashing.
Folders I had to give new permissions: C:\Users\Username\AppData\Roaming\Adobe\Adobe Illustrator CS6 Settings\