Suddenly no sound in Youtube

I'm using MacOs 10.6.8. Flash player 11.8.800.168. For no apparent reason suddenly the sound doesn't work in Youtube. I turned the sound On, Sound off, On again, restarted the computer, Deinstalled Flash player, Installed again, tried turning of/off the settings (storage), installed in Firefox the add-on 'youtube flash to html 5'. Nothing works. I use Firefox 24 and safari 5.1.10. Sound in vimeo works fine, but apparently that doesn't use flash.(?)

That's because the sound is now muted, by default, on all Youtube videos.  Whether this is a glitch on Youtube's part or was done deliberately by them, no one knows, since Google, which owns Youtube, hasn't released any information about this to the general public.  (They HAVE acknowledged that the problem is on their end on the various Google "help" forums,.)
In any event, to un-mute the volume, hover your cursor over the very tiny and hard to spot speaker icon which appears in the menu bar of the video screen.  (It will have an "x" by it indicating the volume is muted.)   A volume slider control will then appear next to the speaker when you move your cursor in the area.  Click on the slider and move it to the right.
ALSO SEE:  http://forums.adobe.com/message/5738852#5738852  for an image of what I'm talking about.
Depending on your cookies settings, etc., you may have to do this for every video you watch.
HTH,
OF
Note to this forum's administrators,
It might be a good idea to post an announcement about this issue.

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