First I would like to say how super pleased I am with the way the bones hold together in CS5. In CS4 they seemed to drift and float the more bones you added.
However this problem is huge. You can see in the picture that the legs of this character are flying all over the place...Despite the fact there are constraints that should be making this impossible. Basically they are trying to do a 360 from frame 1 - 5. I am getting this kind of thing WAY TO OFTEN! Also, this animation just started with a raise of the hand. The legs where never moved!
This seems to be something related to constraints? it seems like it would be solvable if there was a way to select the individual nodes (legs that are doing the unnecessary 180) and delete their keyframes like most other animating rig programs.