Why is my iOS 6 device missing all iTunes Match playlists? After upgrading to iOS I don't see any iCloud playing list in my iPhone.

The lists are OK in iTunes on my two OS X devices but not on the iPhone.

In the Music settings:


iTunes Match is switched on
show all music is also switched on


Any hint?
I also found renaming the missing playlist in OS X caused it to appear back on a device that wasn't showing it.