There is for sure a problem on disconnection. It sometimes hangs, especially when the disconnection is unexpected. For example, on arcnet, when i reconnect too quickly, the server disconnects me (rather annoying) and sometimes amirc crashes on this disconnection.

Amirc can also hang when you try to join a channel you're banned from, on connection.

All these bugs are probably fixed in the unreleased amirc versions anyway. :)