I bought the Unreal 2 Anthology the other day and it had 4 games in it, including Unreal 2. All the other games work great, but when I try to play Unreal 2 the mouse seems to be acting strange. Like when I look left the screen will turn like normal for a fraction of a second (like maybe only 8 frames. I get like 30 fps though) and then it will suddenly jump to the left a significant distance. It will do this about twice a second if I keep moving it. The faster I move it, the farther the jump is, and it'll jump about 60º (out of 360º) in whatever way I move the mouse. It doesn't matter which way I try to look either. Also, when I try to strafe and not use the mouse the action is smooth, but it's only when I move the mouse that where I'm looking suddenly jumps. It doesn't make me move faster when it jumps, the jump only messes with where I'm looking instead of actually making time skip a few seconds ahead in the game. I paid money for this game, so I'd like to be able to play it. If anybody knows what the deal is or how to fix it then please lemme know. Thanks in advance to anybody who can help me out here!

It just sounds like it's a sensitivity setting or something. It's not a bug, well at least it doesn't seem like one from your explanation. Try messing around with the settings.

I am sorry for reviving this dead topic but the exact same thing is happening to me. It is NOT sensitivity related. Graphic or input settings dont change anything. I even tried editing the .ini to disable VSync. (I found that as a solution to mouse lag in UnrealEngine games.)

Any ideas?