Does anyone else have a sound bug with Windows 8 or is it just me?

My problem is that the windows 8 sound settings will not control flash videos?

I can have the whole system set to mute, but firing up a browser and going to youtube still gives sound. I've even tried going to the system tray and checking that firefox/chrome/ie are set to mute, and they are, everything is.

It seems that my Windows 8 sound settings for the whole OS don't apply to flash videos?