It seems the folks at Disney's Pixie Hollow site now force everyone to use the Flash 10 player to hit the site. Since the combination of Flash 10 and Linux fail on this site ( see my earlier post here, my kids are out of luck until this is resolved.
This is the only site I have ever seen that fails to be cross-platform/Flash compliant. If I were real ambitious, I'd investigate it further. But for now, telling my kids to play on another site works just fine.