Jared, I tried your suggestions, even prior to my first post to this forum. My thoughts were that I was missing a simple setting somewhere, and eventually my thoughts went to “perhaps it is just not ready for (my) D750 quite yet”.
Ken, My trial version of a different package just expired so now is a good time to make a comparison. I believe SGP offers more features, but I need it to get along with my devices.
So, if anyone finds a solution, please post it.