I kind of wish I heard about this before I ordered the game, but now's too late since it's already shipped.
Anyway, for anyone planing on getting the game Ar Tonelico 2 on PS2, be aware that a game freezing glitch is present in the game at a specific boss battle where the game will freeze no matter what at some specific point.
I seriously hope that NISA is planing on rectifying the issue as it does not bode well for the company image as a whole on this.
If you look at forums about the game, you can see that this issue is widespread, and present in literally all copies of the game.
I've contacted NISA about this issue, and will post whatever answer they'll give me (if any)
But if nothing is done, there might very well be a class action suit involved at some point as the game is near unfinishable because of this!