One of the problems here is the data size settings of your browser
(the browser can't download and keep the necesary data for the chatsite)
Second: sometimes the chatsite is restricted by the browser security
For fix the problem you just need type in Google "Macromedia Settings" and click in the first link for have acces to Settings Manager of Macromedia Console
Now, select the "Global Storage Settings panel" Option in the left side on page and move the option data size until "nothing" and choice "100 kb" again.
Ok!! This should fix it, but if the problem persist, then go to "Global Security Settings panel"
and change from "always ask me" to "always permitted"
If the problem coninue, report it to an admin.
This section is intended ONLY for topics which are no longer relevant, but may be needed for future reference.