Sounds like the resolution is off.
What is your monitors resolution?
If it isn't 1920x1080, please open the TC.opt file and change the first line to your monitors width and the the 2nd to your monitors height.
You can also access this by going through settings in game, since it sounds like you can type it's just that your input is being shown off screen. Open the game and type 3 then hit enter, then type 2 and hit enter, then type either 1 or 2 then hit enter. For me 1 is the resolution of both my monitors together and so is incorrect.