Ok finished first set of testing.
Everything worked for me.
I first formatted the memory card on my Macbook.
Then made some setting changes from the Macbook Lukas Viewer V1.0.4. (need to try the V1.0.5)
Put the memory card into the camera.
Connected to the camera via wifi. Confirmed that my adjusted settings were shown. Then I changed a few settings from the Lukas viewer on my iPhone.
Brought the memory card back to my macbook, and opened the Lukas viewer, and updated settings were shown.
By the sounds of it, you need to reformat your memory card.
If the Lukas viewer is not seeing it, open Disk Utility, and format the memory card as MS-DOS.
Then open the Lukas viewer program, and it format again through the Lukas viewer program.
Then change your settings.
That should do the trick