I've seen this problem for so long, I've become desensitized to it. In flash 8, flash CS3, and flash CS4 (with and without the 10.0.2 patch), the program crashes and burns about 75% of the time when I
leave the playing swf open, and
publish preview again.
I would think in this case flash should just close the playing swf from the first publish preview before opening the second one, but most of the time it crashes instead. I've gotten used to closing the swf manually before I publish preview a second time - I guess it's just one of flash's "endearing" little quirks. Does this happen to anyone else, and does anyone know how to fix it? Does adobe know?
The second publish is doing a simulate download, so it's a different thing happening - but of course it shouldn't crash Flash. Is this 75% of the time with a particular file, or in general with all of your files? Have you done this with the Task Manager open and is the memory going way up when you go into simulate download mode?