In case anyone here uses Razer Cortex...

[Rusty Shackleford]

Razer pushed out an update forcing an in-game overlay to show your FPS, GPU utilization, etc. in the top left corner of the screen. I was scratching my head trying to figure out how to turn it off thinking it was NVIDIA's fault but it wasn't.

So if you see a green and black overlay pop up in this or any other game, hit CTRL+SHIFT+Q to turn off the overlay, problem solved. If you have a different hotkey or it doesn't turn off, open Razer Cortex, go to settings then hotkeys to change the hotkey to turn the overlay on or off.