I reported this same issue regarding the wordpress mu and allowed another wp mu user to visit the server hosting account via ftp and they said they corrected that issue with a change to the htaccess. All examples you have reported were the same.
I don’t know what was changed in the htacess file
wordpress-mu-1.0 at the bottom of the dashboard of wpmu
Is version 1.0 equal to 2.0 in the standalone wordpress?
So will any api be available for this version of wordpress? Is there any security issues because their isn’t a api?
Jean Andre Vallery