Currently working with a human rig, had some strange deforms with random verts, move the arm and the head explodes, so to speak, So I went to weight Paint, the strange deforms showed no weight color but I was able to fix them.

However, while testing the rest of the rig deforms I select a new bone and pose it ,,,,it works , the mesh deforms,,,,, but no weight colors show up for any of the bones except the first one I worked with


Any Ideas?

Thanks
Joe