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This was happening to me before I updated yosemite. I don't think it has anything to do with the update.
 
If the problem can be fixed by changing the user agent I would not blame apple ;)

If that works it's pretty clear that youtube delivers bad content if it thinks Safari requested the content.
 
I stopped using Youtube on my mac because it requires Flash, unless I switch to make youtube think I am on a iPad. Google/Youtube is still in the 80 with that flash crap. if you switch in the dev menu to the iPad client, you force youtube t send you the videos differently and then it works for me. I don't even have flash installed on my computer any more.

But until youboob/goggles eliminates the flush requirement, I am avoiding them altogether (sorry about the misspellings - well not really. :D)
 
Same problem here. The funny thing is if I change my user agent to Chrome it starts working again.

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I stopped using Youtube on my mac because it requires Flash, unless I switch to make youtube think I am on a iPad. Google/Youtube is still in the 80 with that flash crap. if you switch in the dev menu to the iPad client, you force youtube t send you the videos differently and then it works for me. I don't even have flash installed on my computer any more.

But until youboob/goggles eliminates the flush requirement, I am avoiding them altogether (sorry about the misspellings - well not really. :D)

On 10.10 Flash is no longer used for YouTube. Might be true of earlier versions as well.
 
Know nothing people really need to lay off voodoo crap like zapping pram and waving chicken bones and blaming Apple updates and what not. It's clearly a youtube issue when Safari works fine if you change the User-Agent string.
 
I think the problem is related to the last Adobe Flash Player update, before I updated it this evening I was able to play videos everywhere, now I can't not only in Youtube but in other websites.
 
Hi All. Im having the same issue on my 15" Retina MBP running 10.10.1. Only noticed this after trying to watch that MS Cortana vs Siri video on Macrumors. Is it just a coincidence? Anyone know of a fix as this is getting really annoying. Recently owning a mac is like owning a Goldfish. Needs lots of care otherwise it goes belly up.
 
It works again if I change the User Agent from Safari 8.0 to Safari 7 - iPhone on Safari's Develop menu.
 
Dear Apple,
I know you don't read these groups (maybe so) but could you please stop putting stuff out that just breaks other stuff? I mean can't you just check it out better first? Hhhhhhhh your reputation is at stake here and I am embarrassed for you. :eek: I LOVE you Apple but C'mon ppl!

My guess is that Apple turned up the cross-domain ad blocking again. You know privacy stuff.... Apple sets videos so the DONT autorun and treats "work around" as an attack. I see similar problems with third party comment systems every new version too. Everybody thinks their website is a special snowflake with third and forth party scripts and ads... You're not special and we don't want to be auto digitally tracked by your webpage pretending to click on links for us.
 
If the problem can be fixed by changing the user agent I would not blame apple ;)

If that works it's pretty clear that youtube delivers bad content if it thinks Safari requested the content.

Just checked the user agent change on my mac.
It works.
 
Based on the evidence, I think YouTube may have made a change that is causing this. There may be a flaw in Safari as well.
 
I think the problem is related to the last Adobe Flash Player update, before I updated it this evening I was able to play videos everywhere, now I can't not only in Youtube but in other websites.

Any idea on how to go back to the previous version of flash?
 
I think the problem is related to the last Adobe Flash Player update, before I updated it this evening I was able to play videos everywhere, now I can't not only in Youtube but in other websites.


I have not updated flash in days if not weeks.
 
It seems to me this is almost certainly an issue on YouTube's end, not with OS X or Safari, given a few things that have been mentioned:

1 - The issue started today, not yesterday. If the issue was introduced in the new Safari, it would have started yesterday, when it was released, not today.
2 - The issue is also coming up for people who didn't update to 10.1 yet - people still using 10.0 are also getting the issue. So it definitely isn't caused by the update from yesterday.
3 - Changing the browser agent fixes the problem. All that does is change YouTube's server to treat your browser as if it were a different browser. This doesn't actually change your browser.

So all signs point to YouTube having an issue with processing the agent string of Safari 8. Perhaps they maintain a whitelist or blacklist for which browsers should be able to access YouTube videos, and they accidentally removed Safari 8 from the whitelist (or added to the blacklist)... or perhaps they did it on purpose, to spite Apple and Apple's users. It wouldn't be the first time Google attacked Safari - remember when they exploited bugs in Safari's cookie policy so that they could track Safari user's via their ad network even when users explicitly asked not to be tracked?
 
I stopped using Youtube on my mac because it requires Flash, unless I switch to make youtube think I am on a iPad. Google/Youtube is still in the 80 with that flash crap. if you switch in the dev menu to the iPad client, you force youtube t send you the videos differently and then it works for me. I don't even have flash installed on my computer any more.

But until youboob/goggles eliminates the flush requirement, I am avoiding them altogether (sorry about the misspellings - well not really. :D)

Tried this? Has been working for a while nom.

http://www.youtube.com/html5/

Works just fine for me without Flash installed.
 
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