I have a number of Smartlists for organizing a subset of music onto my iPod. The first Smartlist is
"All iPod", which performs the filtering. After that, a number of secondary Smartlists use
playlist="All iPod" to catgorize music from the subset.
This has worked well for years. Now, when I look at a secondary Smartlist, I see the odd expression shown in the image and can no longer create or edit such Smartlists. If I click OK while viewing the rules for a secondary Smartlist - even without editing any field - the secondary Smartlist no longer works. If I look at the Import/Export text field, it's the same before and after, but the Smartlist no longer limits its entries to those in
"All iPod".
This image shows "Playlists" as pluralized, but using playlist= or p= does not work either. This Smartlist actually works, as long as I don't press OK at this point. After that, it will no longer work.