In the "Theater View" slideshow allow for multiple artists pictures using the semi-colon (Wink in the "Artists" tag. It was this way at one time, but got changed somewhere. Now it only shows pictures of the first artist listed.
After some further research, it appears the semi-colon feature still works, but can be a bit one-sided in the artwork shown. For instance when playing Trio, by Emmylou, Dolly, & Linda there are way more pictures of Dolly. Like 10-1. If I list one of the other artists first I will get a more equal presentation, though the last listed artist is not ever shown (at least not before the track ends). Could use a little tinkering.