If you have noticed any Flash "sandbox" error messages popping up with the Flash 6 player or greater, then please refer to these TechNote articles:

"Loading data across domains" (16520) http://www.macromedia.com/support/flash/ts/documents/load_xdomain.htm

"Macromedia Flash Security Sandbox" (16629) http://www.macromedia.com/support/flash/ts/documents/security_sandbox.htm