Editing a polygon vertices snaps do not stick

[pbrain19]

I am using the polygon directive with the editable of true. I noticed that if I create a square I am not able to edit the corners of the squares but I am able to edit the ghost points that appear between the real vertices. If I attempt to edit the edges, the changes I make stick for about 1 milisecond only to be reset back to what it was before I dragged the corner to make the change.