Can't change playlist (all models)
The SweetPea3 does not allow you to select empty playlists. Playlists may appear
empty to the SweetPea3 if they contain songs encoded in an unsupported format
because the SweetPea3 simply ignores these formats. Ensure that all your songs
are encoded in a supported format for your particular model of player and that
the firmware is up to date. Also ensure your songs are not protected (encrypted).