Sounds like you are logged in perfectly fine since the chat is loading.

However, from what you describe it sounds as if your Java either isn't compatible (less likely, but possible) or more likely you are running a firewall program that is blocking some ports on your computer.

From my understanding, the chat program uses a non-80 port number for chatting - such non-80 port connections are blocked by some firewall programs.

In short, do you have a firewall program and/or anti-virus software running on your computer?

If so, try checking the connection logs (most such security software logs connections) for error messages about ports/connections being blocked around the same time you tried the chat.

Hope this helps.

Ron