Have you tried clearing the browser Cache and the Flash Cache? The Flash cache is cleared at http://www.macromedia.com/support/do...manager07.html and then clicking on "Delete all sites". Shut down and restart the browser after doing that. It may not fix your problem but it is worth a try.

If it does not, use the Support tab in the game Chat to open a ticket. Make sure you include the server and your game name in that server in the information provided. Be as specific as possible including the approximate date and server time when it happen. If you have any evidence, such as screen captures, attach it to the ticket.