ok i know about that problem, it's because of name collision, your username is still available on the server and the client try to reconnect using that name, receiving an error
I've to fix that. i think that if someone write a message it should autofix, but i agree that's a bug that i've to fix, anyway report that on the other forum so i can keep track of bugs and we don't fill this thread with things related to my client that people aren't interested in