Kernel panic when using external hard drive for library

I have been using an external hard drive to manage my iTunes library for over a year. As of today, I have had three kernel panics when trying to use iTunes. I was downloading a purchase from the music store and the first panic occurred. Subsequent panics occurred immediately on startup of iTunes. Using the guest account (with default internal drive library settings), everything works fine. Both drives have been verified by Disk Utility and all software is up-to-date. No clue how to proceed.

Yes, but you need to have the external drive on and mounted when starting iTunes. You can add the external HD to your log in items list in System Preferences -> Accounts to handle this.
This explains how to move your files: iTunes for Mac-Moving your iTunes music folder: http://support.apple.com/kb/HT1449

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