So, in iTunes, I update a playlist, rip or buy some songs, or even create a new playlist, then I select "update iTunes Match" from the iTunes Store menu and...two days later, they're still not showing on my iPhones and iPads. They show up on all my Macs and PCs. The only way to "update" on iOS is to disable and re-enable iTunes Match. Which means I have to download gigs and gigs of songs to each device every time. What a farce. Why not just have an "update iTunes Match" option on the iOS devices? So bloody annoying.