Hi Elbert,
The “Army Green” color is a known issue that happens with Lightmaps generated with the new auto-generated lightmaps feature.
I must say, I’m a little confused on my end. The two images you linked are of different selected items. Are the ones with the house or the ground mesh giving you the shadow issue? The second image looks like a ground mesh, which would probably need to have its lightmap resolution set to a higher value to get better shadow quality. Depending on the size it was scaled to, you may need to set it at 256, 512, or 1024. I would test these settings and build lighting.
To go back to the house. Is that a single plane with a texture applied but not other geometry detail?
Thanks!
Tim