I have worked this out with Dragnar. Everything is fixed for him now.
The problem was that he was trying to start a second copy of ConnectUO, not realizing that one was already running. ConnectUO minimizes to the tray when you connect to the shard and will not let you start a second copy when the first is still running. You can tell if CUO is running by the small globe icon in the tray.
See you on the shard,
GhostRiderGrey