I just looked at all the posts since Lost Alpha was released and I didn't see anything about those sliders. When I first installed Lost Alpha I played with it a bit and didn't have any problems seeing in buildings when exploring Cordon or going into the factory after the bandits, but I did notice the gamma, contrast, and brightness sliders where not working.
When the new official patch was released, it was mentioned in the release notes that those sliders have been fixed, along with a bunch of other stuff. I did a complete fresh install of the game along with the official patch and Programs and Features shows I'm running v.1.3.0013.
Now, I can't see in any of the houses in Cordon without turning my flashlight on and it's the middle of the day. My gamma, contrast, and brightness sliders still are not working.