Blinking Movie Clip Problem

I am having an incredibly frustrating error in a Flash game I am creating.

Basically, the problem is this:


Whenever I open my game, and either go to test the game or publish, several of the movieclips will constantly flicker from visible to invisible, for apparently no reason.


It appears to happen only with movieclips within movieclips, however that is not the weirdest part.


If in the library, I click into the movieclip that is flickering, when I once again test the movie, the flickering is gone. Yet every time I re-open flash the flickering error returns.


I am thoroughly confused, and any help would be greatly appreciated!


I am using Flash 8.