Sonos did not find my iTunes playlists when updating my library.
iTunes stores playlist info in the file iTunes Music Library.xml. I found it on my Asus in C:\users\Asus\Music\iTunes. I tried adding this folder to the Sonos library but still no playlists.
I keep my music in a different folder C:\iTunes Music, which I add to the Sonos Music Library. Sonos finds my music here.
Sonos seems to need the xml file in the same folder as the music. So I copied and pasted the xml file to my C:\iTunes Music folder. Now Sonos finds the playlists.
I just have to remember to copy and paste when I create a new playlist. BTY, I love Genius for making playlists.
I am not sure how I found this solution. I may have to credit someone else. But I could not find in prior conversations. So I thought this post may be of help to someone.