When you try to crouch, do you notice that your view lowers? Can you tell that you're crouching when you hold down the crouch key? Just making sure.
If the crouch key isn't bound properly and not working when you press it, that would mean you'd need to go into the game options and check how your keyboard controls are set. Maybe the crouch key somehow became unbound.
If your view lowers when you crouch . . . then that's a very odd problem. Right now, I can't think of a reason why that would happen, other than the key not being bound properly. I've never encountered such a problem before, with or without the KA mod.
You could also try reloading the Autosave for this level and making your way back to this point, and see if that makes any difference.
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