MOTU driver no longer recognized by Logic Express 7

I installed a MOTU 828 mk3 Firewire audio interface to use with my Logic Express 7 several years ago and have used it consistently ever since. No big issues.
A few weeks ago a friend attempted to install a new audio driver unsuccessfully.
Now Logic won't recognize the MOTU driver in core audio even though I'm hooking up the interface exactly as I always have and have enabled the external audio port in Preferences. I've uninstalled and reinstalled the MOTU audio driver, and everything seems to have been reinstalled successfully.
All my software for OS X 10.8.1 is up-to-date as far as I know and I've exhausted every avenue of enabling the core audio that I can think of. At this point, I'm out of my depth in figuring out how to get the core audio to recognize the external driver. This is not a input channel issue, as the core audio is not even recognizing an external driver is hooked up to the driver. I've also tried a new firewire chord to no avail.
Any guidance on this frustrating issue would be very welcome.
Many thanks,
Seth

http://support.apple.com/kb/TS1538

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