So, does that mean that our problem is theoretically solvable? Currently, I have a small script running that automatically disables your loader when I'm switching to a fullscreen application, but it doesn't always solve the problem. For example, I start Battlefield 3 (or any other fullscreen D3D application), and your loader gets closed by my script. Then I have a somewhat 50/50 chance that the mouse jitter stops. I don't know why this is the case, but I would love to assist you in troubleshooting this problem Peacem4k3r In my case, the only thing that was working in Battlefield 3 was to restart my PC, even if the loader already was disabled.Greetings from Germany