News from the offical site:
Don't forget to update your game password before open beta begins next week! Updates made

to the account system require that all players who created their account prior to July 29

change their passwords to log in to the game when open beta begins.
To update your game password:

Log in to your NCsoft Master Account.

Click Game Accounts.

Select your Aion game account.

Click Change Password link in the Actions section, and follow directions to update your

password.

Or you can choose the same password as the one you used previously. If you applied your

preorder key after July 29, or if you created your Aion beta account after July 29, 2009,

no action is needed -- your account is ready to log in during open beta.