In the /blogs folder as well as in /blogs/admin there are two files called [sample.htaccess]. You should try renaming those to [.htaccess].
This will optimize the way b2evolution is handled by the webserver (if you are using Apache). These files are not active by default because a few hosts would display an error right away when you try to use them. If this happens to you when you rename the files, just remove them and you’ll be fine.