Actual Gamma stuck at setting '1' - JENS TAKE A LOOK PLEASE

[plees]

It could have something with the monitor or the graphic card settings to do, seeing as it has to be the problem since you put the gamma up and down in-game.

I am 100% sure that the problem isn't concerning my monitor, since it has run Amnesia on an earlier PC with absolutely 0 problems.

for TS: I think the problem consists of the game not working properly with my GTX 560. Have any technical supporters/other people from Frictional Games ever heard of anything like this?