Strange behavior occurs when I press 'start' on the left controller. If I use Razer Hydra Configurator software it crashes Fallout:NV to desktop.
And if I use Sixense MotionCreator SDK then it doesn't crash, but pressing 'start' behaves like I'm pressing TAB, Esc, or Shift+Tab. Each new pressing of 'start' button gives the result of pressing the next keyboard combination in order. Remapped 'esc' to another Hydra button, but quite interesting what could be the cause of the problem.
Not the last thing to mention that I use Russian version of Nev Vegas (Changed options in Steam), must consider that it's odd itself. Later maybe I'll try to change back to English. But I don't expect changes in connection with keyboard bindings with localization.
P.S.: By default in .MCE 'esc' is bound to left controller 'start'