» Tue Nov 09, 2010 10:36 pm
It's a lighting issue, see how the trees, rocks, player don't appear to get dark at night? The grass is changing because grass is reflective, so without the day sky it isn't reflecting. The other objects aren't reflective so don't change appearance.
My first suggestion would be some sort of conflict between two or more of the following:
_Real_Lights.esp
Natural_Weather_HDR_by_Max_Tael.esp
10Interior_Light-7162.esp
The BOSS note after Natural Weather HDR by Max Tael catches my eye rather quickly:
". Note: Original mod is heavily bugged. Make sure you are using Ryu Doppler's fixed version."
Disabling this ESP would be a wise first move.