Are you utilising YouTube client such as PrimeTube for example?http://www.windowsphone.com/en-us/store/app/primet
At this time some content from YouTube is not available as YouTube have changed their access methods which makes some applications, such as the ones available for Windows Phone, unable to play the content. It will be up to the app developers to update their apps for this function to work again.
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im not getting youtube at all i tried downloading the youtube app and it failed every time i try and go on in it goes straight to the optus recharge page but i have crediti keep calling and checking and i have 468mb please help asap