walk behavior is distorted

These can be a pain to remote diagnose. Could you include a screen shot of the rigging hierarchy? Can see if can make any suggestions from there. The relative positions of Head and Neck tags makes a difference for example to body posture. Missing the waist handle I think can make the legs not work. If you look at the "Walk" behavior, there is (I think) a "Handles" section that shows the layers it has bound the different body positions to. I would have a look at them - did if find the arms, legs, etc? If anything failed to get found, the behavior would not know how to manipulate the puppet. That is where I would start - making sure all the right layers got found by the Walk behavior.