L2J Server

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L2J Revision Number: 5207
L2JDP Revision Number: 8702

Hello out there.
I have a strange Problem. It's not the first time i set up a L2J Server, but this Problem i never faced before.
I have a WIndows 2008 R2 Server.
I downloaded nightly Builds this morning and installed the Server like it is described in your WIki. Database installation worked liked a charm, i configured the Loginserver.propertiers, configured the ipconfig.xml file with my external IP Address. I set Auto Create Accounts = True
The Loginserver starts even without a warning or sth like this.
Then i installed the L2 Client (GOddess of Destruction)
Now i want to Login but always recieve the Error "Account data is incorrect" and the Loginserver CMD WIndow tells me sth about "invalid username creation/use attempt:"
So i googled a bit and did turn off the Autocreate Account and registered an Account with the SQLAccountManager.
The Account is in my Loginserver Database (i didn't switch database name or Login credentials)
But when i try to login i get the Error "Account is missing" at the Loginserver CMD Window.
I reconfigured MySQL, i even used another MySQL Server Database on another Server (configured everything to use the correct Database) but i don't get rid of this Error.
Can someone point me in the right direction to solve this Error?

Thanks in advance.
Edge

High Five client is required.
You will need to find a download for it.

Then i installed the L2 Client (GOddess of Destruction)

L2J Server is High Five still.

Thanks for your help. Sry for asking this dumb question.
Everything is working like a charm now.