I have just spoken to someone in Apple Support who has tried to be helpful by finding out whether it is a known issue or not and any associated resolution plan. However what he tells me is that a change has been made in TVOS 15 such that the only screen saver that will be displayed while music is playing is the album art, not any photos. He wasn’t able to answer my point that this effectively makes the setup options for screensaver in the user interface pointless - though he did say that he understood my point. So, the bottom line is that it’s not a fault, it’s doing what TVOS 15 is supposed to do. He is going to feedback internally re the frustration that customers will feel about this. We can raise enhancement / development requests to reintroduce what we used to have.