Flickering lights

I'm not sure if this is a bug or if I'm doing something wrong, but I'm getting huge problems with lighting in my game. Whenever a light goes across a terrain, the terrain flickers like mad, this is especially noticeable when I have a night vision light on that covers the whole area.

I've also noticed that having two lighting effects on at the same time causes problems. Like if one character has a flashlight, and another is in night vision mode, the character in night vision mode only sees one or the other, the first characters flashlight, or his own night vision light. I'm also getting shadow flickering problems while in a night vision mode. Though I found a forum that suggests that may be a video card issue or possibly something from the footprints(?).

Has anyone else had these light flickering problems, I'm especially worried about the terrain flickering problem. Does anyone know a way to fix this?

Thanks!