When you mouseover an entry in the connections tree a tooltip is displayed showing "Name", "Method", "IP / port", "User" and number of Expects.
If you now demand userinput for the server name (e.g. to create a generic connection which asks you for the target servername and performs some post connect expect magic, everytime you mouseover the entry in the tree, dozens of input dialog are spawned until you move the mouse away from the entry.
You need to select another item in the list, use the cursor keys to select the broken one and press "delete" to get rid of it as you can't use the mose for that.
Suggested solution: Don't parse the servername when displaying the tooltip but just display it as is. It wouldn't make any sense otherwise.