Played it before and never had the problem, thought id play again and im having this huge problem in possession where the camera very jerkily, out of possession is fine, and its an intermittent thing. Any help?

I have the same problem

Try this: https://github.com/elishacloud/dinputto8/releases

Just extract it into your game folder.

Old old old post but you never know in case someone else needs an answer to this that may help, I tried all sorts of downloads and fixes but what helped me in the end was to start up DK2, alt tab out and start the taskmaster and then make sure that I allowed DK2 to use all processor cores. Worked like a charm for me.

This fix worked for me as well!

(I didn't have this problem when I played the game less than a year ago on the exact same system, which makes me curious why it's an issue now.)

Does anyone know a way to force it to use all processors by default (instead of having to go into the task manager every time)?

You're an angel

Please let me know if you found a way to set it by default. Cheers to all in this thread :)

This might have what you're looking for:
https://www.eightforums.com/threads/cpu-affinity-shortcut-for-a-program-create-in-windows.40339/