Chat not working on one machine

This so weird why would chat not work on one of my machines but work fine on another one. Flash is up to date, tries to load then you just get the ajax that says connection and the bottom url bar says done.Is it a machine setting? Thanks

delete history and cahce on the browser then try again. Delete the Flash cache too.

http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html