I'm using iTunes 12.5.3 on Windows 10. I am trying to create a smart playlist that selects songs from other playlists, limited by storage. (Much like in How do I configure a Smart Playlist to show songs not in other Playlists?)
I have a number of these lists already, which I created several years ago, with a previous version of iTunes.
My problem now is that I am unable to select any particular playlist in the smart playlist dialog. The playlist name is defaulted to "Music", as shown here:
Further, if I open one of my existing examples, the dialog will show the playlist(s) I'm harvesting, but won't let me edit the playlist names.
What is going on here? How can I fix things so this works?
I know that an alternative solution is recreate the rules that form the source playlists in a new smart playlist, with the additional size restriction. This is what I'm now doing as a work-around, but it would be preferable to just get the feature working like it once did.