Game now runs well without need to use gamefix but still gets stuck to gray screen after it loads first Heartless encounter. Still improvement.

Doesn't get stuck for me.

You are probably using an older version, however I can't help but find this post redundant, because this has been said over and over again, and has no point. That bug has been posted alot. Though not many people have that problem anymore, and can even complete the game, though some report no in-game music.