I see that all my playlists are missing -- I thought it was just a glitch, so I"m just now getting around to posting this.
I think the culprit may have been that I tried out the web version on my Chromebook. I had a whole ton of playlists: A totally sweet one called Drive inspired, a nostalgic sweet one called when I was a freshman...so wonderful..all..gone! :((
I see from other messages that the spotify gremlins know how to repair this, but I'm more than happy to help try to debug this if anyone needs the help (being a web developer myself 😉 )