Purchased Music Not in Library
I'm seeing a bizarre problem in iTunes 11 for Mac that I can't seem to pin down. I use iTunes Match as well, in case that's relevant.
Ever since I upgraded to iTunes 11 a few days ago, when I purchase new songs from the iTunes Store the computer appears to download the song(s), but they never actually appear in my iTunes library. They don't show up at all, even as "cloud" tracks or real tracks. They're just not there. My iPhone, on the other hand, seems to receive them instantly. So, after making a purchase there are only two ways I can receive my tracks: (1) sync with my iPhone, which causes the tracks to sync back to my Mac, or (2) go to the iTunes Store --> Purchased --> Not on my computer and download them from there. Even when downloading from there I only have about a 50% success rate.
I have tried repairing permissions and several restarts; those didn't work. I have also tried creating a new iTunes library. The problem doesn't seem to occur with the new iTunes library, just the old one (which contains all my stuff).
When the problem happens, the purchases songs don't appear in my iTunes at all. Not even in the "Purchased" playlist. I can't search for them either. Nowhere. But, if I go to the iTunes Store-->Purchased or reach for my iPhone, there they are. Very odd.
I buy a lot of music from the iTunes Store, typically using my Mac rather than my iPhone, so this is important to me. I'd appreciate any advice that anyone can offer, no matter how simple you think it is. Thanks.
MacBook, Mac OS X (10.7.5), 2.4 GHz Intel Core 2 Duo, 4 GB RAM