"New station from artist/song" broken since a week?

Hello all,

I've replied to this in another thread but that one was based off of the Windows version of iTunes. I'm on OSX 10.10.4 with iTunes 12.2.1.16 and since a week or so I can't start a new station from either the artist or the song. All the other stations that are under Radio work fine, and previously generated stations on my iPhone are usable on the iMac version of iTunes. But I can't start a station from iTunes itself based on an artist or track.

It might be relevant but I am logged in into the iTunes store and I'm using a family sharing subscription. As far as I know all the settings should be correct like this.

The moment I press the button "new station from artist" the iTunes display in the middle turns into the Apple logo.