Grain appeared while using nanovision. It became more grainy - and harder to use,

what to do?

This is my autoexec
r_NightVisionBrightLevel = 0
r_NightVisionCamMovNoiseAmount = 0
r_NightVisionCamMovNoiseBlendSpeed = 0
r_MotionBlur = 1
r_MotionBlurShutterSpeed = 0.0001
g_skipIntro = 1

Well, I shouldn't give away trade secrets

...but you can still get clear Nanovision. You need to add the top 3 lines from that code of yours to your game.cfg file in your users folder. It seems the developers have been trying to stop people using this trick but so far their efforts are too easy to circumvent. Now this game.cfg file gets re-written when you exit the game (unless you set the file to read only that is )

Until it's properly locked down I think it's only fair that people have the info - you know cheaters are gonna use it, and the rest.