It sounds to me like you are using a different Rom Version and Only Good [!] V1.0 versions are supported in the 1964.cht File, so although you see the Cheats in the menu they will not work as Your Rom is a v1.1 or v1.2 etc. All version Roms need Different Version Cheat Code. So unless you are using a Only version or V1.0 [!] Version of the Rom, the cheats just will not work.