you gotta' be kiddin' me! that could indeed explain itThis is because DirectX has a default refresh rate which is used for any screen modes that are different from the current desktop resolution.
yep, but nothing there right now, as it should be(Also your nvidia card's properties (in Display Properties->Settings->Advanced) might have a "Refresh Rate Overrides" page where you can specify a different refresh rate for each screen mode)

i'll try changing that default refresh rate, that's interesting (and a good lesson to all programmers, so you don't only have to set display resolution, but also offer an option to set refresh rate, duh)... i guess
thanks, chris_b