Often times when right-clicking on a Movie Clip in the library and choosing "Export SWF..." Flash will either take a long time to complete the function or become completely unresponsive. I can usually get it to eventually work reliably by opening Flash again and repeating the action. It will eventually become less slow at doing this, which is the bizarre thing about it. It seems to go back to completely crashing the software after a machine restart.
My info:
Flash Pro CC 13.0.1.808
Mac OS X Lion 10.7.4
Processor 2 x 2.4 GHz Quad-Core Intel Xeon
Graphics ATI Radeon HD 5770 1024 MB