So, out of frustration, here's the fix (and so I can find it easier next time!):
***NOTE*** ConsoleOne needs to be run on the Linux server hosting the MTA not a Windows workstation.
- Open up ConsoleOne and check the path to be sure it points the correct mount point on the Linux server.
- Change the UNC path if needed. If it comes back as a "\" or an empty UNC path, the fix gets harder.
- If the path becomes a "\" or "\\wpdomain.db" or some convoluted conflagration of borked up path names clear out the UNC path in the MTA. Close it.
- Click on Tools | System Preferences | Linux Settings and delete the UNC path there.
- Open up the MTA object again and BROWSE, not type, to the correct UNC path (i.e. /media/nss/GW_VOL/domain/wpdomain.db).
- This should fix the dreaded error that prevents you from getting to your GWIA eDir object.
I wish I could say this has been fixed, but I'm currently working on an 8.02 HP2 migration where this got borked up again.