When you have data on Left and Right collar in the bvh file , these are mapped on the same parts parts in P4 and MW. Yet these parts work different in both figures. Whereas P4 can have more than 30 degrees up down, MW has about only 30 degrees, more looks weird. Go in the graph editor and delete all keyframes on the left and right collar in the MW figure, thats it. But you are out of luck when the complete arm movements are in the collar channel and not in the shoulder . At least this works for me. Karl