I can't tell what's wrong, does bl work when on a clean install?
Heres the problem/part of the problem
DNS lookup failed: irc.centralchat.net
It failed at looking up the DNS for irc.centralchat.net, so he cant connect to IRC.
We already know it isn't connecting to the irc. This does tell us that past authenticating it can't connect to the internet, or really the dns server. What happens if you try reauthenticating?
Also:
Solid, you're an experienced forum member, did you purposely post in the wrong section?