The Net tool in Firebug reports that the request comes back as a 204 (No Content) message.
(I'm not really sure how to tag this because I don't think it's a bug per se)
Update: The chat boxes on the right hand side don't show up until the 15 second mark. Disabling antivirus does not change the result.
Update 2: Could someone post the kind of result I should be getting so that I can determine if a firewall or something might be blocking it?
Update 3: This is the code that calls the resource: