View in cab faces right,,,,cannot move the view to look forward

Started yesterday, when getting into the cab of an engine, the face is usually to the right, left or back. (never looking out the front window). I usually could move where I want to look by pressing a button on the mouse and moving the mouse to the view I want But now it seems to be locked.
Has anyone else experienced this, and how do you fix this
Has anyone else experienced this, and how do you fix this