I have an iPod Classic, latest gen, 160 GB. iTunes doesn't recognize my iPod for some reason. It shows on my Mac desktop, on the iPod screen it says 'Connected, Eject before disconnecting,' and my iPhone is showing separately in iTunes via Wifi, but my iPod classic (latest gen) won't show up. The only thing that has changed on my computer since my iPod last showed up in iTunes is that I installed the OS X NTP Security Update through the Mac Store, not saying that's what is causing it but that's the only thing that's changed. I haven't installed any other applications or made any changes to my Mac at all. I can successfully eject my Classic by double tapping to get the dropdown menu and choosing to eject, and it says "Ok to disconnect" on the iPod screen just as if I did it from iTunes. I also tried following steps at this link, but still have the same problem.