I’m not really sure how long it’s been happening for me, but it’s only started somewhat recently. If I have shadows set to Low (I have to do that, my PC sucks), there’s an awful flashing or flickering. The lighting abruptly gets brighter or darker on numerous maps. I think the only condo map that doesn’t do it is the House; it also happens in the plaza. All game-worlds appear to be fine.
It really makes it difficult to play on a lot of maps, and I’m not able to increase my Shadows setting.
I know this has been reported before, but there was no real solution, other than using a higher Shadows setting, which is unviable for me.
Screenshots: (Sorry for awful resolution, again, bad PC)
On the Condo map:
http://imgur.com/XYmYUI6
http://imgur.com/tBtdgWq
Both screenshots were taken mid-day, 100% clear weather, but it appears to be dark. Even the flashlight does nothing.