How do I change the order of songs in a playlist?

I know that I used to be able to drag songs to a different order in my iTunes playlists, but tonight, no matter the order that I add the songs to the playlist, or Smart Playlist, the order of the songs is alphabetically arranged, and the only other option is to click on "name" but then it just does reverse alphabetical order.

Is something different, in a recent iTunes upgrade? I'm a music teacher and I am trying to put the songs in the order that my students will be performing them next week, so this is driving me crazy tonight!!!!

Thanks so much for sharing wisdom on what I am doing wrong!