Thanks for the quick reply. TBH, I always believed album art was provided as part of the metadata on the radio stream itself...
I understand it's not an essential feature, but I listen to radio streams most of the time. I've got MB displaying all the info through CDArtDisplay, and it's nice to be able to see album art instead of a blank place holder. As you mention, I can stick to an older MB version, but on the other hand I wouldn't want to miss out on future updates either, so pardon me for my ignorance, but would there be no other alternative to last.fm for album art?