I have these bushes loaded into my night time scene by using a Landscape Grass Type and for some reason they maintain their light. I have built the lighting several times (still not sure why it says my scene needs rebuilding). I have turned off ambient occlusion, turned off two sided mesh, set it to default lit, and made sure all LODs are casting shadows. I managed to fix this issue for my trees and grass by turning off the two sided option, but the bushes are still giving me problems.
Screenshot: http://i.imgur.com/5PARXDk.png
Specs are intel i7, 16 GB of ram, and nvidia 660ti. Any help or suggestions would be much appreciated!