All the polygons ARE grouped to bones - I tried to stress that in my original post. That was the first thing I thought of and I have checked it thoroughly - you just have to trust me on this. To answer one question - yes it does happen with the other arm but not with the legs if you are wondering. Falloff zone? That isn't in the manuals index. In the pdf file I did a search for falloff and that comes up in reference to magnets which I haven't used here. I set this up by copying over an existing bone setup like in the tute on pg 69 of the manual - does that have something to do with it?