that's another negative, there's no setting for brightness in the game therefore you need to just use the nvidia properties and increase the brightness in the advanced tab but than it will brighten everything up. I don't like making everything bright for just one game that's why I just lower the blinds in the room, making the room dark and then I can see everything in game fine.
Most monitors now tell you the user mode you're running, let's say user mode 1 is set to 800x600 and user mode 2 is 1024x768, check the user mode at the menu screens and then check the user mode aftering the game has started on a map, if the user modes are still the same then there's a problem.