Hi Graham this is the official answer;

YouTube has stopped supporting playback of certain types of video clips on some Smart TV platforms that are more than 3 years old. This results in the picture freezing on some content, and it affects not only Beovision 11, Beovision Avant, Beoplay V1 and Beosystem 4 (Video Engine 1.x platform) but also Smart TV platforms used by other brands. Unfortunately, as this relates to the platform, we will not be able to resolve this issue with a software update.

Regards

Stuart

Thanks Stuart. I guess that this is another reason not to buy anything that relies on built- in software that can become outdated overnight.

I've also just found that Amazon Prime video will not run on earlier Apple TV's, even though the app is there and you can get the first episodes of TV series to run, but then find that subsequent episodes are blocked unless you have the latest generation Apple TV. Is it too cynical to think that this is all part of the business model? Change the software... customer upgrades hardware.... wait a year or two, rinse and repeat.....

Graham

EDIT

Correction. Someone else had logged into the Amazon Prime app on the Apple TV. When I cleared that log-on and put in my own password then the Amazon Prime Videos became available. (So what is needed here is an upfront warning about who is/was logged onto the Amazon site, just as you would have at the top of an Amazon iPad or PC page.)