This is fantastic. But one thing I am really puzzled. You seem to get the same effect. At time 1:47 in your video you move a control point away, But the lines do not follow. I found that this is the case even if I move 3 or 4 of them. But really, strange is that when I undo then I see it DID move the line and it did rubber band. What is going on? I thought i had a bug in my system.