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no i have that installed already. i was started watching 1 video about a minute of it started playing then the page refreshed and just a black screen on the video same with every other video now
 
no i have that installed already. i was started watching 1 video about a minute of it started playing then the page refreshed and just a black screen on the video same with every other video now

I had the same issue, some videos would show and play other were just black. I never figured it out before returning my rMBP. I figured it was something ML would solve.
 
Since YouTube is Flash based you might want to try reinstalling the Flash player.

no i have that installed already. i was started watching 1 video about a minute of it started playing then the page refreshed and just a black screen on the video same with every other video now

Having something installed is not the same as reinstalling it.
 
Having something installed is not the same as reinstalling it.

i did a fresh restore of mountain lion and manually installed it after along with many other stuff, don't think reinstalling it will do anything as i just installed it today
 
i did a fresh restore of mountain lion and manually installed it after along with many other stuff, don't think reinstalling it will do anything as i just installed it today

Did you try with any other browser?
 
For Flash-related issues:
  • Find your Flash version and make sure it's the latest version available. Never install or update Flash from a pop-up on a website. Always go to Adobe's site to get Flash or updates.
  • Install ClickToFlash (Safari), Flashblock (Firefox) or FlashBlock (Chrome) to control which Flash content plays on websites.
  • Try using the YouTube HTML5 Video Player to watch YouTube videos, when available. (May impact fullscreen viewing. See link for details.) Some have reported better performance with HTML5, while some have reported worse. Try it and find out what works best for you.
 
For Flash-related issues:
  • Find your Flash version and make sure it's the latest version available. Never install or update Flash from a pop-up on a website. Always go to Adobe's site to get Flash or updates.
  • Install ClickToFlash (Safari), Flashblock (Firefox) or FlashBlock (Chrome) to control which Flash content plays on websites.
  • Try using the YouTube HTML5 Video Player to watch YouTube videos, when available. (May impact fullscreen viewing. See link for details.) Some have reported better performance with HTML5, while some have reported worse. Try it and find out what works best for you.


won't solve your problem but this is what I'm using on my "couple-of-days-old-waiting-for-ML-redeem-code-2.3-16gb-256-retina"


https://forums.macrumors.com/threads/1403890/
 
I also have problems with flash player, but its only with Safari. Try running it on Chrome or Firefox.

Here is an attachment of Adobe Flash plug in - (before updating)

and one after...

Update: Even after I updated Flash Player, Youtube still doesn't work. Maybe Youtube has to change their video input or ML has to adjust! I miss seeing my Youtube videos! I mean i can watch them if I click on a specific video in my safari history, but not the homepage.

I hope it gets fixed soon.
 

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