Do you have java runtime installed or not blocked in ur firewall?? However there is no one interesting to chat these days either a bot is there or even if someone talks will later invite you to those ugly site & dirty cameras which i hate!!
You can't join a chat room in Yahoo! if your age in your profile is less than 18 years.And anyways dude, why do you want to chat with hundreds of bots? Yahoo! Chat rooms are full of crappy bots who keep sending you their cam & profile links. I seriously hate 'em.