I installed your chat on my site, but only with my pc there is strange behaviour.
I Cannot see the chat, but i see only a button "Send" with a white rectangle above.
I tried to reinstall flash or to use firefox, with the same problem.
This problem appear also on your site.
Maybe, you block my ip?
Check your Flash settings at http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html
Hope that helps