I start with a Connection Window that has a long list of entries and group by the user. I highlight any of the "bottom" entries with my mouse. I close the Connection Window and make a connection. When I re-open the connection Window for a new connection, I noticed that when I scroll to the top of the Connection Window and click on the + node to expand the user list for that entry, the Connection Window jumps back to the bottom entry I had first highlighted. This happens every time I open the Connection Window but if the Connection Window stays open, it doesn't happen for later + nodes that I try to expand.
WORKAROUND: Instead of clicking to expand the + node, highlight the desired entry first then expand the + node.
STATUS: Waiting for fix in a future release of Toad for Oracle.