I solved the problem. I had accidentally loaded mg1 files and since the song picker doesn't automatically update its list, I didn't notice that the saved data was in an MGU file. It's one of the reasons why I've never wanted to get more involved with band in the box. There are so many overloaded dialogs, but unfortunately they don't reflect things like filtering and sorting according to modern and common criteria. Every time you use the program, you feel like you're back in Windows 1990, even though you're working with a MAC 2024.