Philip
Being strictly an Elements Windows user, I am not sure where the Elements Organizer 12/12.1's psa.prf file would be located on Mac.
However, if you cannot find that file in Mac, based on the Windows counterpart, please check out Elements Organizer 12/12.1 Edit Menu/Preferences/General and the "Reset Default Settings" at the bottom of that section of the Elements Organizer preferences.
We will be watching for your results.
Thanks for the follow up.
ATR