Subtle animations choppy in CS3


I’m doing some button animations in CS3 that contains animated bitmap elements. The bitmaps should have subtle movements on rollover, but I can’t get smooth movements (as I could in Flash 4-8) when I animate the bitmaps over small X, Y distances. The animation gets choppy, like some sort of pixel snapping in on or something. If I increase the X or Y distances the animation goes smoother, but thats not the “look” I want for this animation.

Is there something new in CS3 that I’m not aware of? Actionscripted animations is smooth :-/

thanks from Chris