Heh, also a funny feature of your anchor constraints: they do not play well with layouts and animations. Try the code below (adapted from the example to use the layout and animation of LRP ) and you will see that the circles keep spinning around, they never stop. I think it would be better for them to stop ;-)
stepping := RTSpringLayoutStepping newview: v; layout: layout;afterBlock: [ v canvas camera focusOnCenter].
I even have a bug report for you … before, when I removed the edge, the label was also removed automatically. Now this is no longer the case. :-(