FPS won't display in game with gamebooster

When I play swtor, it won't let me display the fps when i use gamebooster. I hit ctr - shift - f and it doesn't work... nothing happens. When i don't use razer cortex at all, i'm able to use those commands to show the fps. But anytime i use razer cortex, it won't let me. I want to fix this because i'd really like to see my fps when using gamebooster. How do i fix this? the only game this seems to be a problem with is swtor, all my other games display fps just fine when using razer cortex and gamebooster.