I'm using iTunes Match on my 4s and both the music in the cloud and my downloaded playlists won't play. However, apps like Rdio and Pandora play music perfectly. Anyone have an idea on how to fix this?
I did see a fix on another site, that suggested turning off Music Sync and back on fixed some people. I don't use music match though and I am having the same issue. I am going to delete my music off at home tonight and re-sync it. See if it comes back.