As can be seen on the screen shot, I want to animate first folding the top right triangle and then along the center line of the sheet using the 2nd bigger bone. and then a third fold of the left side triangle. However when I do my second fold the whole sheet scrambles up. Some of the vertices from the two assigned grouped overlap, so I am not sure if this is the problem for blender. What is the correct way to make this work, or maybe it is just not possible in Blender?