I am trying to export a rendering to Radiance and I have set all zones/objects to the same material so that everything has the same reflectance, color, etc. Unfortunately when I render I have one wall that comes out a greenish/yellowish color. I cannot figure out why. The materials are all set to the same greytone color. The zones are all set to the same greytone color and The foreground is grey and the background is white. I have tried changing my surface display to background, foreground, material colour, and zone colour and no matter what I do, I still get this one wall that is a greenish/yellowish color. Please let me know what I seem to be doing wrong.

Thanks,
Chris