If your game constantly starts up in the wrong resolution edit your RavenShield.ini file:
Go to section: [WinDrv.WindowsClient]
and set values to your resolution.
My game has constantly been starting 800x600 and having problems changing to 1024x768.
I changed these to
and it fixes the problem. If any one else has simular issues with RvS (or S4) you should consider giving it a shot. Now if only I could aim when I play the game at 1600x1200