Ok, I've been having this problem for over a year now. When I play Graveyard Shift, the crosshair movoes along with my mouse properly and smoothly. However, when I put up the shield and move the mouse around, the Shield significantly lags behind my mouse. It moves very choppily. Therefore, levels after the 4th level are impossible to beat since I can't block the shots shot at me.
Does anyone else have this problem? I have updated Flash Player and have done numerous other things, all of which made no difference to the game. Please help if you can.