Shape Tween in AS3 consistenly causes crashing

I had a nice graphic of a shape-tweening flame from AS2 which instantly crashes an AS3 Movie, so I tried copying frames without the tweening. No dice, same behavior. Then I traced over the original shapes, recreating them from scratch, and got rid of the AS2 graphics. Still crashes. Mind you, this isn’t even tweening, it’s just some still vector graphics. Finally, I tried redrawing the flames in Illustrator and copying them over. Same thing, which specifically is: no output error, just buggy behavior, all the images animating in an endless loop.

Any insight on this?