My Logitech Media Server (aka Squeezebox Server or LMS) stopped finding new iTunes playlists at some point and I couldn’t figure out why. After updating, rescanning, resetting, etc., I was still in the dark. It would find and add new songs, but not new playlists.
Here’s what happened:
iTunes switched at some point from using the iTunes Music folder to using the iTunes Media folder. Since I had configured the iTunes folder on the Basic Settings tab of the LMS settings, the new songs were being added as a result of a folder scan, but the iTunes plugin was not finding the songs, and as a result not adding the new playlists because they appeared to be empty playlists to LMS.
Solution: I used the instructions for Upgrading to iTunes Media organization from Apple. This got all my media in a single place, and once I ran the LMS scanner again, it found all my songs and playlists, both old and new.