Was listening to the last Beach House album, first track. Switched to the King Curtis “Play Artist” under “Discover”. No result–got the message indicated in the topic line (“played_empty_swim”). Subsequently got the same message when I tried tother "Play Artist"s .

I’ve seen this error on my setup as well. If I recall correctly, it seemed to occur just after I’ve finished playing my favourite tracks and trying to play them again. The only way to resolve the issue is to restart Roon.

Hey guys – we’re aware of this issue and we are planning to address it when we spend some time working on our Radio algorithm soon.

The issue generally happens when you try to play a performer that has no songs of their own – in the future, it will smarter and play songs the performer played on, even if they were not the main performer.