Try clearing cookies as well as cache. cookies are in the same place. After that, close your browser and wait for a few seconds before opening it again.
If that doesn't work, Make sure you have a high enough version of Flash Player. It should tell you on your private page if you need an upgrade. Lastly, check your internet speed. If you're not on Broadband or high-speed internet, then it will take a while to load. When I was on dial-up, it took about an hour to load when I'd been on another website with Flash Player. If you can see the galloping pony loading screen, just give it time.