Actually, I've beaten the game with all characters and had 0 issues with the trainer. Legit copy? Right key press? @_@
Maybe I haven't had enough credits to narrow it down, but I haven't had much luck on that one yet, everything else yes, but that one either just hasn't worked, but I haven't been able to narrow that one down far enough yet. I get down to like 30-60 addresses and run out of things to buy or money.