My Wordpress Mu installation is under the domain http://it-gnoth.de and blogs are created as subdomains.
In the Blog Admin Settings Panel there is the field 'Dashboard Blog'
The field is filled with 'it-gnothde'.
If I remove this string and press the button 'Update Options' it appears again.
the description:
'New users are added to this blog as subscribers (or the user role defined below) if they don't have a blog. Leave blank for the main blog.'
How I can get this field blank?
Next point is, that I tried a new user registration and the user gets always a redirect from the login page to
http://it-gnothde.it-gnoth.de
which do not exists.