GotoAndPlay()

I have a MovieClip.gotoAndPlay() statement in my code, but for some reason there is a chance that the statement will be completely ignored. When it’s ignored, my movie acts as if the statement was never there, and I can’t see a pattern in when my movie ignores the gotoAndPlay(). It seems like it just doesn’t gotoAndPlay() when it feels like it.

Is there anything that might cause such a phenomena? Anything that might stop a gotoAndPlay() from being called?