The only things i can suggest:
1) Use the latest version of Internet Explorer. Chat doesn't work with AOL, Netscape or any other browser.
2) Make sure javascript is enabled on your browser.
3) Make sure cookies are enabled. Check the chat thread for details.
4) Give it a little while to load. It takes about 30 seconds for me. You can see it's going to work if you can see a clock in the bottom left of your browser in the status bar.
Hope this helps.
Craig