Hi Gerry,
You were right, the file was a read only........but that didn't fix it. I did discover something though. Once I have the homing/limits set so the axis' jog in the correct direction, if I even go to one of the config screens where the apply button is, and open that screen, the home/limits will revert back to their original settings.
I was hoping someone else had had some sort of a problem like this and could shed some light.
Mike