"One or more actions are not bound to a key"

For what reason I don’t know, I can’t change any of my key bindings and, worse yet, all of my settings as a whole. This does more than peeve me, the game is practically unplayable because I am not comfortable playing how I want to. I’m not sure how this strange glitch came about and I’m not sure if anyone else has encountered this bug I came across, but its damn annoying and doesn’t allow me to play the flight as smoothly as I want. Control is very important in an FPS game, and if I’m confused as to which button I should press to throw a grenade, I will not play.

There’s a keybind in Halo Reach’s Theater section that likes to unbind itself. Just rebind it and everything should work.

yep pretty much what he says check reach key bindings for some reason that is the issue with not being able to change key bindings