Did you edit the b407 own camera.cfg? if you did you can translate view left and forward back in the cockpit, or backup/delete this camera.cfg in the own b407 directory.
Other wise you can,
Redownload the b407 and see if the redownloaded give you normal in cockpit view.
In the meantime you can also try the passenger seat or check the rotor close up with translate view
Translate keys press alt plus arrowkeys on keyboard shift plus arrow will give panning
And single Up and down arrow height change up or down