problem with f zero rom for snes9x

[cheatah]

iv downloaded many f zero roms for my snes 9x emulator they all run but all of them only show half of the screen and makes it impossible to race

what is the problem and is any one else haveing the same prob

pls note i am not asking for rom im just wondering if any one else has this prob and weather its something wrong with my emulator settings

[brent2k6]

change GFXengine to psp accur+approx, settings

[cheatah]

cheers m8 the reason i dint try that befor is because i did not want to mess with the settings incase it messed the emulator up and then id be put back to square one which was very annoying