Hey guys... I've been building a museum and am at the point of lighting it, and suddenly when I try to render the scene the lights now will not render and the scene is completely dark. anyone know why this owuld happen? Maybe it's a limitation of my card, but I tried deleting some of the lights and it makes no difference. In the Attribute Spreadsheet all the lights are on. I'm rendering with mental ray but even with Maya software it still does not render the lights. What's odd is that some of the interior cases render fine but not the structure itself. Any help would be GREATLY appreciated!