I've upgraded my iPhone 4 to iOS5 and, in Settings -> Music, turned on 'iTunes Match' and 'Show All Music'. When I open the Music app, however, it says "No Content" and then briefly shows a picture of the iCloud and a status bar (as if it's checking to see if there is music "up there" to import). It then goes back to saying "No Content". I have a number of songs purchased that I am pretty sure are loaded in iCloud. I installed iTunes 10.5 on my Windows box (my primary box is a Mac) and it magically pulled down the songs. Any thoughts on what I'm doing wrong?