"Since there is no Ambient Occlusion Slot in 'Texture Set' Mode of the nXt-Material Editor,
I found another way around what to do with AO Maps:
Baking it into Diffuse; e.g. Multiplying AO Map over Diffuse/Albedo/Colour in…"
advanced rendering for AutoCAD
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Have you gone to "edit style" on the walls, windows, & doors to override the default style definitions in the materials tab of the "Style Properties" menu?