I recently began experiencing problems on Facebook when trying to load some of the games that require Flash. For some reason nothing wanted to load. Tried other browsers and had NO problems whatsoever. After about 4 days of investigation I found that the Avast! plug-in extension that was installed into FireFox was blocking the the Flash content. NO messages or anything…simply hung during loading.
If anyone else is experiencing the same problem open the “Add-Ons” tab in FireFox…select “Extensions” and disable the Avast! extension. Or do what I did and uninstall Avast! and installed AVG Free… ;D