I have a feeling it may be a Bios Chip Issue..(((?)))..(Japanese formatted Memory Card trying to save a US settings game..
What Bios chip does the other Candy have in it...?the one that the card is not working in..
I'm figuring you have a:
Japanese AES
Japanese MVS mobo(that the card works in)(or UNI Bios Chip set to Jap)
US MVS mobo.. (that the card doesn't work in)
Shoot bro in all this time we've known each other you'd think I'd know by now what MVS mobo's you have..
Otherwise..check the pins on the mem reader...See if any pins are broken off or bent/Blow out any dust..
What I think you have to do is re-format the card to work in the mobo that you are going to use it in..
Problem is:if that mobo doesn't read it and you don't have another of the same bios mobo it may not be possible.
I may be totally wrong on this..
I figure if you re-format the card in a Japanese AES or Japanesre MVS it'll be formatted to read Japanese only..