Reboot your computer. That can often 'reset' such problems.
Or try another browser. That should install the new Flash on all browsers.
I keep getting a message that I need to download a newer version of Adobe Flash Player. I un-installed the old version based on Adobe's site. But when I attempt to download Flash Player 11, it gets to 99% and stops. It never fully downloads and just stops. Is there a back-door way to get this version? I've tried CNet, Adobe and directly from the game I'm trying to play.