Children of Mana:
Just an FYI, the problem with the original Children of Mana trainer (not sure if anyone had any problems with the update) does not appear to have anything to do with Cracker's patch. The actual AR codes cause some black screens as well, sometimes when using fury (not to mention that select doesn't always fill the meter as it says) as well as changing zones. In addition I have seen a few instances where the infinite HP does not work, some zones your HP will still decrease, then the next zone it works fine.
So if anyone does have problems with the trainer, be warned that the actual AR codes have problems as well. It does not affect the save, so you can just use a clean rom, get past the problem point, then go back to the trainer.