I’m sorry. This was a mistake on my part. A heads up to anyone else out there — do not have two windows open when you change settings in theme options. It can lead to conflicts. In my case the window I had open for Custom CSS also had the display mode set to grid. In another I was changing the display mode to standard. This was creating some very strange behavior that was hard to sort out!
The Theme Options page is just one big page so even if you are working on settings in one section the other sections settings still have an affect when you click Save Changes.