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Jul 18, 2012 12:09 PM in response to j-andsby Kenichi Watanabe,As a test, shut down (power OFF) your computer. Disconnect all USB devices, including any hub device. Do this to Reset the iPod
http://support.apple.com/kb/HT1320
Start up computer with all USB devices disconnected, except for standard keyboard and mouse (if used). Run iTunes. Connect shuffle to a direct USB port on computer. See if it still causes the lockup.
If it's better, add your other USB devices back (one at a time) to see if the problem recurs. If it does recur, there may be a USB device conflict. Or, all of your devices connected together may be drawing too much power from the USB bus, causing the computer to "freeze." The iPod charges its battery from the USB port, so it is a high-power device.