Dave,
Good Morning, Good News.
After verifying that SU2016 worked on my Mac, I started thinking a little more about what might be impacting this. Since I didn’t have the 3rd party extensions on my Mac that I have on my PC I renamed the file for THOSE extensions so sketchup would not see them. Then I uninstalled SU completely and used a fresh download from their website for a clean installation. Now I have SU with only the extensions they provide and everything works as it should. I appreciate all the effort you and John put in. Thank you. At some point I am going to reload the other extensions 1 at a time and see which one may have impacted the operation. If indeed that happens I will update you on that