Make sure you have the latest version of flash and that your internet is running smoothly. If that doesn't work, have a go with another browser - does that work? Otherwise, I'm not sure what else it could be.
After making sure your plugins and browser are up-to-date and that your internet is fine, if the problem persists I'd submit a bug report to Fizzer with details about your browser/flash/OS versions and specifics about you problem. The place to do this is here: http://warlight.net/ReportBug