I had such "greeny" issue with some Wildhammer buildings and problem was that I actually really missed one reflect BLP. WMV didn't export that image, but it was used and needed. When it was missing, places covered with that shading reflect turned a bit greeny. Some more, some less. IF is huge WMO with huge amount of textures, I know, but I would start again in 101/HxD and check if you really do have all BLPs used in your game patch, especially BLPS which have "reflect" in their name.