It's a common problem. And before anyone says so, it is not because he is using the mac version
Normally it is just something which you can wait out an it will fix itself. Clearing your browsers cache won't effect it at all.
You could try to clear your flash players local storage by going:
System Preferences>Flash Player...
But it's unlikely to make a difference.
It will probably be a few hours to a few days before it does fix. If you're still having trouble then I'll look further into it