Ok here is my feedback since i had the same problem.

I had no problem so far but yesterday i changed from my 19" TFT to a 22" , so my resolution changed from 1440*900 to 1680*1050

 

I tried to delete game.prefs and it didnt work.

What i did was to open this file in the notepad and add/change some lines.

 

i changed to fit my changes


primary_adapter = '1680,1050,60'  

 

i added thoses lines


                {
                    text = '1600x900(60)',
                    key = '1600,900,60'
                },
                {
                    text = '1680x1050(60)',
                    key = '1680,1050,60'
                },
                {
                    text = '1680x1050(59)',
                    key = '1680,1050,59'
                }