Egg...

I think I figured out why it doesn't tween. I had converted the Live Effects flames to bitmap. Then I tried to change the shape of the bitmaps, completely forgetting that changing the shape of a bitmap makes it a different shape.

Flash doesn't tween bitmaps. (At least I don't think it does!)

So I am now in the process of playing with ways to simulate flame using only vectors, so that the tweening will work. I'm actually making some progress, but nothing good enough to post yet.
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Will