I found that on my Xbox , when I enabled fps boost mode. I lose the scale option but when I disable fps boost mode I can change HUD size. This sucks because I can't game at 120fps with the HUD blown up out of proportion. Does anyone have any ideas what's causing this?
Not a solution, but curiosity: can you visually see the difference between 60 fps and 120 fps?
AC current makes LED lights oscillate at 60 Hz (~60 FPS, if you want to compare it light that) without specific controls. Some people can't see the flickering at all without movement.