Just an FYI...I lost about four hours development time today because Flash CS4 continually crashed after a 2 second live time. Yep...open a file and then 2 seconds later it would close down.
Here were my steps to resolve it on my Mac with OS X:
1) Repair Disk Permissions
2) Reset preferences
3) Reset user settings
4) Uninstall and then reinstall
None of this worked.
5) 45 minutes on hold with tech support who directed me to a web page, FOUR TIMES, that resulted in a 404 error each time.
Finally, the solution that worked is to
6) Turn off all my fonts. Yep, turn all of them off in Font Book, and then turn them back on as the system calls for them, or as Flash needs them.
Turn off my fonts!!! Since when do fonts cause an expensive and complex program like Flash to crash. Whatever.
It's easy to turn off fonts in Font Book (right mouse click on Computer and choose Disable Fonts) and the Mac asks permission to turn them on as you need them, but here's the kicker.
It worked fine last night. Today, I didn't install any fonts, I just opened Flash files and wanted to work. What mystical creature got into my Mac last night and played with font settings?
I don't know, but man, I hope this saves you a call to Adobe tech support...Adobe, I love ya, but please get me a stable version of Flash.