I've sorted this - I don't understand what happened, but if I did right click, 'Edit Playlist' noticed that some playlists were not 'Music.' I set them back to Music and they sync'ed ok. Odd, but sorted. Thanks!

I've been happily using MM to transfer playlists from my Windows 10 PC to my iPod, but suddenly this no longer works. I've even done a factory reset in iTunes but no luck.

Specifically, I have a number of playlists on MM. As I've done for many years, I select one, right click and select Send to: iPod Nano (3) Synchronize but now the files do not show as transferring and nothing ends up on the iPod

Any suggestions please?