Apparently, an issue I forgot to mention in the other thread (my apologies for the inconvenience) is that, when I have a bunch of songs loaded in the Playlist Editor, if I execute the "Previous track" feature twice fairly fast through either the keyboard shortcut (as in pressing the keyboard key to go back to a previous track twice within one second) or through the program's main window (as in clicking the "Prevous" button twice within one second), the program will skip past the last song loaded in the Playlist Editor and go to the second-to-last song.
I don't know if that action was something that was intended to be, or if it's something that was missed when the program was being developed. Regardless, just figured I'd let you know about this one as well.