IDJC lets you add multiple servers on the same network which creates the possiblity that it didn't work due to a netsplit or because you have too many logins on the same IP address for a particular network. Note that that includes your regular IRC client.

IDJC only issues its IRC messages when you are streaming.

That said try running IDJC from a console. Look for error messages that start with "Traceback". I want to see all that stuff. I need to know what version you are using as well since this may turn out to be a bug that was fixed.