When something’s not working delete aso files
If you are running Vista and have the Flash 8 IDE installed on your machine it takes forever when you click on a movieclip to edit it. Here is how to fix it.
Right click on the shortcut to Flash (or the Flash exe file itself should do the same), click Properties, go to the Compatibility tab, and check the box next to “Disable desktop composition” — this helped a lot for me.
It took me a while to find that online so I hope it helps.