MB1/MB2 buttons not binding

Hello, my keyboard has a messed up Space Bar (meaning it is being heldtogether by tape) so i usually use the MB2 button on my mouse to return the camera to my champ, however during the latest patches i havent been able to do that i even looked at my keybindings and on secondary it still had MB2 listed on it, but the control wouldnt work, i tried unbinding it but now it wont even take the binding when i press the MB2 button to bind it, can we get this fixed? i get scared of playing and having to use lockscreen, doesnt feel right to me.