I have SNES9x and ZSNES (not sure which version) and I acquired several ROM patches for FF6, including "Darkstar," "Hardtype," and "Omnispoof." Unfortunately none of the ROMs seem to work after the patch is applied. Is there something simple I am missing here?

I'd also like to know if it's possible to apply multiple patches to a single ROM so I can enjoy all the modifications without having to play through separate games.