Hi Jeff (your name trips me out because our contractor on Long Island was Jeff Prince :-)),
You know, I somehow fixed it, and I don't know how. It might have been about un-clicking Camera, which I have no idea what it is. But yes to your question: no changes from Open GL, just hit Render Final Exterior, and it goes away.
I had tried by giving the site model a texture, a class texture, No Render Texture but a fill....nothing worked. Even though I accidentally fixed it, I'd love more input for future reference. Also, what's OIP?