Rob,
I found the Library Preferences, but they contain a folder: com.camerabits.PhotoMechanic.demo_registration. Is this only for the Demo version, and could it be why I am unable to register the post-demo program?
It shouldn't interfere. But it shouldn't be a folder, it is a file.
I was wrong about the path earlier. It should be:
/Users/<your user name>/Library/Preferences/com.camerabits.PhotoMechanic/com.camerabits.PhotoMechanic.registration
So the demo you found would have been this:
/Users/<your user name>/Library/Preferences/com.camerabits.PhotoMechanic/com.camerabits.PhotoMechanic.demo_registration
Did you check your permissions on /Library/Preferences ? That is the preferred location.
-Kirk