This is a sporadic problem where I'll be putting CDs into the drive and clicking the Import button when the alert box pops up from iTunes. At some point iTunes doesn't complete the Import task, but rather the the CD disappears from the navigation panel altogether. I then have to manually eject the CD, then reinsert it, at which point I again click the Import button--this time it works. Bottom line: I have to put a CD in twice before I can rip it. Lame.