iPhone 4S->iTunes "Transfer Purchases" not moving music
I recently purchased 2 albums on my iPhone 4S. When I go to transfer them to my Mac (late-2008 MacBook), I use the "Transfer Purchases" option under File. I see the songs in iTunes under Music (in the main library, not on the iPhone), but they are all grayed out with the Sync symbol next to each song (also grayed out). Each time I select Transfer Purchases, iTunes goes through the process to transfer but immediately completes without moving the music. I only use one ID to purchase, so I don't get any unauthorized errors. I'm not sure what to do next.
Any help would be greatly appreciated. Thanks!
Chris
MacBook, Mac OS X (10.7.2)