I can see other graphics options (1920x1200 is my native) but its all highlighted in red.. it will put the menu in that resolution if i press exit while in a game but nothing else is that resolution.. and the whole game lags a lot.. i just can't seem to understand why this is happening.. i set things up with the autoconfig_MERCS tool but it never saves it.. when i open it back up, its set to low with 800x600 again

my system is as follows
Windows 7 Home Premium 64-bit
8 gigs of ram
GTX 260 x2
has anyone else run into this sort of thing?