The Solution for my Problem:
Go on the official RotMG Page, create a new Character. DON'T CHOOSE "Best Server" in the Server List, choose the one which fits you.
Finished the Tutorial, go back to 059 client, switch to the same Server and join with the character, that worked.
Go on the official RotMG Page, create a new Character. DON'T CHOOSE "Best Server" in the Server List, choose the one which fits you.
Finished the Tutorial, go back to 059 client, switch to the same Server and join with the character, that worked.

