Mac won't recognize iPod Touch after library move

Ever since my music library outgrew my internal hard drive and I moved it to my Time Capsule, my computer doesn't recognize my iPod Touch when I plug it in, though the iPod is charging from the USB port. I've deleted iTunes, rebooted and reinstalled in accordance with one of Apple's help pages, but to no avail. I've also tried creating a new empty iTunes library on my internal hard drive and starting iTunes from that, but that hasn't worked either. Any ideas?

I've followed all steps in the following troubleshooting documents:
"iPod touch not appearing in iTunes" sections 1-7;
(http://www.apple.com/support/ipodtouch/assistant/itunes).
"Mac OS X v10.6 or later: iOS device not recognized in iTunes after restart";
(http://support.apple.com/kb/TS3540).
It may be of interest that I do not have the file "/System/Library/LaunchDaemons/com.apple.usbmuxd.plist~orig", which the latter document recommends deleting. I suspect that that file is either unnecessary or it should be recreated by iTunes, so it seems an unlikely candidate for the source of the problem, however.
Message was edited for clarity by: pyrogerg

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I think I might have fixed it (touch wood, cross fingers, etc)...
Here's what I did:
In Finder, under "Go", select "Go to folder".
When the box comes up, enter this folder name: /system/library/launchdaemons
Click "go"
Locate this file: com.apple.usbmuxd.plist~orig
Put it in the trash
(NB: there's also a file called "com.apple.usbmuxd.plist" in that folder - don't touch that one)
Restart computer
Open itunes, connect ipod
If the ipod appears in itunes, restart and try again to confirm it's working.
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