Hey, I have a problem. For some reasons, when I try to play the game, I can't load, because it load up to fill up a yellow bar of the loading screen of KH X, and after it's filled nothing happens. I try every and nothing. Anyone happening this? I tried clearing cache, another browser and nothing. I use Firefox for that.

How long are you waiting after the bar fills up? Sometimes, especially after midnight JST, it takes a while (a few minutes) for the game to load just because there are so many people logging. I suggest waiting an hour or so and then trying to re-log in. There should be less people trying to access the server.

Hopefully this helps.

I have that problem sometimes.  Usually clearing the cache is the last thing I do to fix it.  Sometimes restarting the computer can fix it too. 

The loading times of the game are a little long. Be patient.