It works.
Once again, the minute I post the question, I find the answer.
This time it was in the DOCUMENTS>LAYERS>LAYERS SETTING.
I had the Roof layer set to Wire frame instead of Solid.
Win 10 Home Premium - AMD Phenom IIX6 1090T Processor 3.20 GHZ 8.00 GB RAM 64-bit Opp. Sys NVIDIA Quadro 4000 AC 22, MEP