Yea, I had this problem for about 15mins b4 the Lakers game... stupid Java. All I did to fix it was turn my Java security settings on low. The problem was that when I installed the Java update, at the bottom it said something like "enable Java security" and I didn't remove the check mark so it turned security on and blocked me from the chatroom.
Haha, if true that's a tricky trap.
Usually when an add on won't run and something is propting you at the bottom, they WANT you to click enable. Who would have thought clicking disable would work?
Also, my java security doesn't even have a "low" setting, the lowest it would go is medium and that didn't do it. Weird how we all figured it out with different solutions.