I have the same problem. I just created this map and when i go ingame the lightning is fked up. I have added the sun like BluntStuffy posted above but that didn't change anything unfortunately. The sound also sounds a little bit weird when shoot..
Video:
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I was tired of copying image files to my mod image folder while working in Asset Manager with Materials. Therefor i created this little tool(It's made in c#) that does everything for you
It simply copies an .iwi file that you have edited to the desired mod folder.