BubbleUPnP: Playlist Trouble

Hi! I have been using Volumio for 3 years and love it with 1 exception: Playlists won’t work properly.
I’m using RaspPi3 with HiFiBerry and WD MyCloud NAS. Playlists will often show multiple listings for songs (only 1 of which works) and have entries without album art. I just learned about Bliss, so I’m going to use that for the album art problem, but i would like to create a playlist that works. Please help since this is really frustrating my wife who is not tech savvy. Thanks