iTunes11 smart playlists not working

I can't get a smart playlist to work on the new iTunes11.

I created one with the search criteria to show all files added after 11/20/2012. Although there are 231 files that fit that criteria, none are listed in the smart playlist.

So I created a smart playlist with the search criteria to show all files with the word "vinyl" in comments. [I record old vinyl albums onto my computer, so I add the "vinyl" comment so that I can isolate them.] This playlist resulted in zero items even though my old smart playlist -the one that was constructed in iTunes10 but transferred into iTunes11- does work. However, my iTunes10 vinyl smart playlist does not list any "vinyl" files added after upgrading to iTunes11.

So I created a smart playlist with the search criteria to show all files where the artist included the word "Smith". Considering that I have many Chris Smithers tracks and many tracks from the Smiths, I would expect those files to appear. And yet this smart playlist also resulted in zero items.

I am having zero luck using smart playlists with iTunes11.

Smart playlists are nothing new to me. I have successfully created dozens of them over the years. Has something changed that I am overlooking?