Hi Brian,

re:
> the three vectors Cannot be erased from MoI4 screen, even if nodeeditor window is closed.

Could be that those objects have their hit testing flag turned off. See here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7777.1595

The fix would be at some step .setHitTest(true) needs to be called on those objects.

- Michael