I have worked around the mouseUp event when it's still down problem. I had put the event listener on the stage and that was giving the problems with composite materials. So I have moved the event to the sphere object and it now works fine.
I'd still like to be able to draw (and move) an artibarty circle around my sphere directly on the surface. Using a wire polygon means I have to 'float' the line a couple of pixels above the spheres surface to stop it intersecting and disappearing for sections of arc. Still the polygon line will do for now. Mark
