I'm also experiensing problems syncing any playlist or track on my iPhone5. "Available Offline" is turned on but nothubg is happening, I've tried switching it off and on, redterting the entire phone etc. The playlist however syncronizes on my windows 8 computer without any problem. Please fix this becauae if I can't use offline mode on my iPhone spotify is pretty much useless to me then 😞
Could you take a look at the steps in this post. If they don't resolve your issue, please give details of exactly what iyou are trying to do and what isn't working. Your spotify and iOS versions and mobile device type will be helpful. Thanks.