Do you have set for Shadow Distance 0m? On my system dark Propast is releated to Shadow Distance off issue. For some reason it affected lighting only in Propast
I keep it a 3m. Another Member, I wish I recalled who, found that 3m was optimal between increasing the speed an properly rendering highlights on Zoe's face. I found it work for me too. Only in Roman's office is a higher shadow called for. Both attachments were taken using the same shadow depth.
I have problems too - in the clound village all that's far away was covered in green, and half of the character faces had something like green light on them almost all of the time.
The village is the most demanding location for my computer. I haven't experience the green light problem, but I need to shrink my display.
Have you tried increasing the gamma?
No, I don't think it is a low gamma problem - Unity 5 seems to overdrive color saturation as it is . It is more a contrast problem and I don't like to tweak the my computer graphic settings just for one chapter in one game.