This link helped:
Regular re-install does nothing. But Adobe clean tool with re-isntall actually fixes this problem.
In some cases deletion of these directories (if exist) can help if problem wasn't caused by OS X update:
/Users//Library/Preferences/Flash CS6 Preferences
/Users//Library/Preferences/Flash 12 MRU
/User//Library/Application Support/Adobe/Flash CS6/
So for me every time I update OS X I'm forced to waste time on these reinstalls which is definitely not fun. Does anybody faced same problem? For me it seems like Adobe Flash CS6 crashes in cases when there is absolutely no reason to crash.