I deleted a playlist in iTunes then added it back in with a whole new lineup of songs. I then closed out of iTunes and hooked up my iPod Classic, (bought new in January of 2013) only to find that this one playlist didn't download. I have uninstalled/reinstalled iTune, following the directions, ver-r-ry carefully, to no avail. The playlist shows in iTunes the way it did before, all of the songs show, but it won't transfer. What am I doing wrong?