Hello! :-)
I'm using SUE, and have been doing that for a while now, but all of the sudden it won't let me edit my elements.
When selecting an element (in this example a conduit - see below), I can see the handle at the end of the conduit. 
When I'm selecting the handle and trying to move it to another place, SUE starts doing this:
After that, nothing has happened, and I have to select the handle again and the same thing happens. It's like a loop, and I can't move my SUE-elements because of this. I noticed that, when selecting a manhole and choosing "Hydraulic Analysis" under "Properties" it says that there isn't any element selected.
Have you had this problem before, and is there anything I can do about it? :-)
Regards
Bo Heidmann