Try save the map + textures, then reinstall GTK 'n fsrad and all the other stuff.
Then try to -fastlight again if that ain't working your pc might suck.
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Dont listen to Vic, he's only saying shit recently :/
http://www.abload.de/img/winm0ja.png
/Win
Sure, one freaking light source thats as strong as a fart.
How do you think that theres gona be some light in there ...
Recheck all your lights if you didn't duplicated them on the same location.