Thank you so much for all your help. I am acquiring a copy of the magazine as I can't read it. It won't blow up from your note.

I think I know what happened to mess up my system that I have used for years. On some product I was looking at in my content menu, I remember clicking on an image thinking it was the .duf for  prop but then realized it said "Render Settings". Nothing happened and I went on with my work but I'll bet that link rejigged my render settings in some way that I can't sewe or undo. Nothing else really makes any sense. It worked perfectly and then an hour later, it didn't.