So I know that you have to be doing a production rendering to use Auto Exposure and Auto White Balance. What else would cause that option to be greyed out? I have it set to a production rendering, but those options are still greyed out. But if I create a new Sketchup file and go to render settings, Auto Exposure works. So clearly something in my first rendering is not allowing Auto Exposure to function. Any ideas where to look?
Sorry, found it. If anyone else cares to know, under Global Illumination > Secondary Rays has to be Light Cache, not Brute Force. That will prevent Auto Exposure from working.