Ever have Styles\Background not function anymore?

[sketchydog]

At some point in the very large model, the Styles\Background function seems to have stopped functioning. I can select the color options, set them, but they don't take effect. color of background remains the same regardless of what I do. Any ideas?

By the way, this holds true for every one of my scenes. It doesn't matter what the background color is set to. Once Ground is truned off, it always shows a medium blue background.

If I copy everything in the model to a new file, I do not have this problem. Of course then I lose every one of my 30-40 scenes. Any way to get the scenes from the first file?