It worked! I had been completely turning off Norton which is current. That only worked to watch videos I had saved to favorites at YouTube. I tried turning off only "ad blocking" and now YouTube is totally back in action after all these months! Can't believe it. I will still continue to look in here to see what's happening and if there are changes. Thanks everyone.

Still the same for me here as well. Tried it all. Even my techie friends are at a loss. Sudden loss of YouTube is still a puzzle. I give it a hopeful try from time to time, but no luck. I bought a small ASUS EEE a few weeks ago with Linux and Firefox. I have no problem with YouTube on it. I would prefer to access it on my 22 inch monitor rather than the 7 inch ASUS screen, but I'm happy with what I can get. I'm going to keep checking here on this...

Youtube was fine until 2 months ago. I tried the control refresh and control f5. Worked twice. I tried everything mentioned in this forum. Nothing works. One odd thing. I can still view the videos I had saved to a playlist at youtube by turning off Norton. Also, I can play a youtube video embedded on another web site. I have installed, reinstalled flash several times. Installed and tried Firefox. Enabled, disabled, enabled Javascript. The list goes...