Hello,
You can either try to connect with another internet browser (Chrome, firefox, opera, IE etc.) or, you'll need to delete Gportal cookies from the browser you and your brother are using.
This message is moved to technical issue.
PS : To change your forum username, go there :
http://en.allods.com/user and click on "Edit" tab
You'll need to log off and on again in order to view the change.