I'm having a similar problem...

When I downloaded mIRC and configured it, I was allowed to pick a channel to automatically join to on connection. Now, when I connect to the server, Mirc automatically joins me to the channel.

I want to make it stop, but can't find any options in the interface to make that happen. I've looked into the scripts and popups files and don't see anything that resembles what I need to edit.

Help!