Yeah, i'm sure the save stat help a lot on this kind of problems. At first i could overwrite, then after i switched to analogic pad (i don't know if it's tied) and then, not able to overwright again (no matter if i changed back to classic pad). I had other problem about saving game with star ocean2 ...

I tryed the US version, and i can't save the game in any slot of the memory card.

Hi i can't overwrite a saved game, i have to use a new slot each time i want to make a new save.
I play the game in us version on a touch pro2 with the ini i found on my device section, i also use the analoic control on the touch screen (it works pretty well !).