I installed the 7199 driver for my Radeon 7100. Before that, I had custom 1024x576 resolution that loaded up automatically when I started my HTPC. Now that I updated the driver, I have to redo my custom resolution, BUT Powerstrip will not let me change the custom resolutions. What am I doing wrong here? I select 1024x768 and go into the screen for entering the data for the custom resolutions (porches, changing the 768 to 576, refresh rates, etc.) and it will not let me adjust the vertical resolution of 768.