Safari will not play Youtube videos!!!

Thanks for that. My problem was not so much with youtube videos, but with videos in html5 on Facebook. Like you, I'd like to avoid Flash as much as possible, so I followed your advice and found an update available for Click to Flash. Updated it, and now html5 videos are working perfectly. So - round of applause to you! 🙂 🙂 🙂

yay, opting out for the html 5 trial here http://www.youtube.com/html5

and removing youtube data in Safari/Preferences/Privacy/Details/ solved my problem Safari not playing embedded YouTube movies. 🙂

Thank you for posting this. We noticed YouTube no longer running on Safari, but in Firefox on several of our Macs. I had no idea YouTube selected us to test hout HTML5. It didn't work. I unjoined and now all is fine!! Thanks a million bbydon!!!

Just signed in to thank you for this great answer, worked instantly, you're like a saint to me and all my friends right now. Totally serious.

Thanks, opting out solved all my problems.

This worked perfectly for me.

My problem was that embedded YouTube videos would not play. Playing videos on YouTube iteself worked just fine. Problem solved.

Thanks for the fix.

leejbarker32 You are the man!!!! Worked for me. Thank you.

Thanks to all of you. In fact I want to the YouTube's HTML5 Trial link as provided, 'un chose' my self, closed Safari, reopened, opened YouTube and it was back. This saved a lot of toggling between Chrome, which I had to use to access YouTube and my primary browser, Safari.

Thanks for your help and for making it so simple....

Type flashplayer in the seach (spotlight), Click Flash player instal manager, then unstial flash player, then go to http://get.adobe.com/flashplayer/

download Adobe Flash Player 11.6.602.167

make sure you instal it 🙂

then restart, youtube.......works

This is driving me absolutely INSANE.

I have 2.4ghz intel core duo Macbook running Mountain Lion and Safari 6.0.2.

Going to Youtube homepage in Safari crashes the browser, requiring a forced close.

I've checked the 'html5' trial link, and I'm not part of the trial, so I can't opt out.

I've uninstalled flash as golarash says above, and reinstalled 11.6.602.167....

Youtube STILL does not work. This is unbelievably frustrating.

What am I meant to do next?

All help hugely appreciated.

Wow, I was afraid to try this in case it was malicious or something but it worked instantly and now my vids play in HD instanly. All of them do. People are saying youtube is being "throttled" I can't believe this is what we are up against and I feel youtube and apple should do something about this publically as it makes us wonder if it is them when it isn't.

My ISP is not time warner. I use verizon which now works super fast.

http://mitchribar.com/2013/02/time-warner-cable-*****-for-youtube-twitchtv/

Worked like a charm. thanks John

Problem solved----HTML5 was the problem--went to You Tube and left HTML5 and my sound is now back to normal----thank you so much for the tip

What worked for me:

I have not been able to play YouTube videos on Facebook since I set up my new Mac Mini. I went through a number of the suggestions here before I finally found out what my particular issue was: Google Disconnect.

Anyone using the extension Google Disconnect might try disabling it, refreshing your Facebook page, and trying a YouTube video again. It worked for me. It also worked for me regardless of my HTML5 status with YouTube.

Hope that helps someone.

I realized that my problem is caused by a 3rd party software "Audirvana Plus", with it odd, the Youtube stoppes at around 11 second.

So I turn the software off, and the problem disappears