I've been using the iPhone app for some time now, and has been working fine. Up until the update before the iPad update. Once I updated, I could only play a song in any playlist before it would break. It would go to the next song that was queued up (shuffle or not), but nothing would be played. The pause "button" was showing as if the app was playing the current song, but the progress bar was not moving at all.
I e-mailed support in regards to this, and gave me a workaround which involved:
So at that point everything was working again. However before the new update came out (added iPad support) this issue came back. And updating the app didn't resolve the problem either.
Even if the playlist workaround works again, I don't have much faith that it will stick.