This may be a problem associated with the recent 10.2.8 Mac OS X
upgrade (I recently did the upgrade).
Here are the problems:
1) I purchased an album from ITMS. I have played the music once or
twice. Now, it's no longer in my iTunes directories, no indication of
the data anywhere on my machine, no indication of its presence in the
iTunes library. (Can I request another copy of the album from Apple?)
2) I recently uploaded a bunch of music onto iTunes (from CDs).
They're not showing up on iTunes, although their presence is seen in
the iTunes ...