*** UPDATE ***
Just to help with the troubleshooting; I am really thinking this has to do with that "Start" frame because when I change the setlist layout to "LIST" (which doesn't use a Start frame), there are no blank songs added to the database.
Again, it's only when a setlist layout is chosen, which utilizes the Start frame, when the blank songs are added to the database.
And as I mentioned before, since they don't appear in the "Songs" menu, you have to enter a setlist mode to delete them, which then adds more blank songs, so it's and endless loop.
Please let us know if there is a fix to this or if it's a bug that you're working on. Thanks again.