OldUnreal (Engine)

This has only happened since I downloaded a few UT mods yesterday, and the problem persists on a fresh install of Unreal Gold AND UT.

Basically, no matter what mouse setting I have, when I'm normally standing or walking (but not in the air or swimming), vertical mouselook is locked. I can look up and down by violently moving my mouse up or down, but it immediately centers. I can look left and right just fine, and I can look up and down just fine only when I'm swimming or jumping.

fresh install? Did take over your old ini settings maybe? I assume there is some messed ini involved.

Go mess with the input settings in the game settings. It's somewhere there IIRC.

Press the End key on your keyboard. That usually helps with this. lol

Or if you have a wireless mouse, check its batteries.........
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Many games have auto centering, Unreal had that as well. It is called lookspring but should only work with mouselook disabled/set in key.