paint skin weights
 

I'm having an issue with painting skin weights,

I am trying to copying skin weights from one piece of geometry to another and then make slight adjustments, but after I have copied the skin weights and try to paint them not only are the influences affected but also the geometry moves, its like its being smoothed or something.

Does anyone know of a way you can lock the geometry when using this tool?

Freeze transformations doesn't work btw.

Thanks
Dave