Just in case anyone thought they'd solved this problem ... nope. Just created a playlist on my iPhone yesterday. It's still there, but doesn't show up on my desktop app or in the web player. And it's not in the list of old playlists available to recover (which is actually a pretty cool feature that I didn't know existed). And I can't tell you how often I attempt to add an album or a song to playlist, but those tracks don't actually get added. Now I have to check every time. Did it really add it? Did it really add it? Very annoying. I love the music selection, but these buggy interface problems are really annoying. I can't imagine how Spotify expects to keep its users once Apple's new platform rolls out later this year.