I've just updated the server with new code (sorry for disconnecting everyone, but it was necessary). Let's hope this fixes the nicknames-staying-online error that affected so many of you.
EDIT: If you experience a sudden "Lost the connection to ..." error in the future, it might be me restarting the server with updates. So check this forum first before you report a problem.
Edited by Phil, 01 July 2014 - 11:31 PM.