songs in Smart Playlist don't copy to iOS 10 device
I upgraded iTunes to 12.5.1.21 on my Mac Mini on Tuesday, and updated my iPhone 6 and iPad Air to iOS 10. I also have an iPod Touch 5 that is stuck at iOS 9, which turns out to be a blessing. In iTunes I have a large number of Smart Playlists, many of which rotate content to least-recently played, or have date filters to filter out songs that have been played in the last week, for instance. So when I play songs in the list, then update the list in iTunes, the played songs are taken off, and new songs come in. All that works well.
Until I update my iOS 10 devices. When I update the playlist in iTunes on the Mac, it shows the new content. When I update my iDevice, it shows the updated songs on the device, using the view from iTunes on the Mac. When I undock the device and check the playlist, there are no songs. All the songs in the playlist are gone. Either the songs are actually there, but the device's iTunes has lost them, or they were never really copied.
This does not carry over to other types of playlists. It seems to affect only Smart Playlists with date restrictions. My iPod Touch still behaves fine with the same Smart Playlists. So perhaps not a problem with iTunes on the Mac, but iTunes in iOS 10.
iPhone 6, iOS 10