I've been having this issue the last 2-3 weeks on any purchased items on YouTube via the TiVo box. Most of the items are TV shows I've had for years but they, along with any new TV/movie purchases, fail to buffer properly. I've reset the box plenty of times, deleted all my profile setting on YouTube and reinstalled. The two technical teams I spoke to tonight for over an hour were very helpful but ultimately there was nothing they could do (speed tests all fine etc and purchases work fine on all other devices where Youtube is loaded, and all other services like TV channels of Netflix are fine; it's JUST purchased items on YouTube these past few weeks).
Any users out there who can offer a slither of hope for me/a solution, then please do get in touch.
Re: Buffering - YouTube purchases no longer playing
'why paid for YouTube content is not supported?'
either the contract between virgin and you tube don't allow it or you tube will only allow access directly through them not any app. likely to be the former as sky you can't do it either and their agreement stipulates the former.