Since I have updated from v1.4 to v1.8 I am experiencing problems now with flickering when in stealth mode or/and nanovision but the parts of the screen that flickers are only me (the gun and hands) not environment or other players. I have done as cryadam said motionblur=1 and shutter..=0.0001, no change and also tried and removed it totaly still no change.

my card - radeon 4870x2

Check this Tread out and let us know if you find a solution.
https://secure.gamesas.com/forums/viewtopic.php?f=40&t=29642