My offline music doesn't work on latest IOS on iPhone 6 under either Albums or Artists. If I click on an Album (or Artist) 3 circles pop up as if it's loading, but nothing happens. Everything is visible (and playable) under the Songs section, but I'd like to use Albums and Artists
I could reproduce your issue on my iPhone 5 and will see if i can get some more information about it. Are you using iOS 8.1? Have you tried a clean reinstallation (You will lose and you have to sync your offline playlists again)?