Did you ever figure this out? I'm still having this same problem. I like to create my playlists on my phone, but when I plug into my iMac and sync through iTunes, the new playlists on my phone dissapear. This is very frustrating and it seems that no one has received any definate answers. If I create playlists on my phone, or on my iMac, when I sync, shouldn't the new playlists and songs go both ways if I have them selected to sync?
Please help! I just took the time to create an awesome playlist on my phone and I don't want it to be lost when I sync next!
Also, I noticed that this started when I upgraded to iOS7, which I see is a common problem for all.
Thank you to anyone who can help!
Hmm this seems to be a slightly different issue than I had. My playlists weren't all together disappearing, just the purchased songs within the playlist would disappear from the playlist (but not completely from the phone). Also it looks like you are syncing your music, whereas I was manually managing mine. Maybe that could have something to do with your problem? I never received an answer on how to fix it, and I didn't actively do anything, but it just stopped doing this at some point. Not really sure what's going on here, but this shouldn't be an issue.