Ive been affected by the dreaded pacifist bug do you have a solution?

Everything is fine when you start a match until you fire a weapon, once you've done that
you can't sprint, every time you jump you shoot, if you have an automatic weapon equipped then it will continue firing untill you're out of ammo if you equip an rpg it will fire straight from the hip.
other people have described the same problems and dubbed it the pacifist bug.