I am an administrator of a site and just recently upgraded to 2.7, yet when I try to edit posts, pages and comments I get a permission error: "You do not have sufficient permissions ..."
Some time ago, I created another username (actually the same name) giving him the role of a contributor. Aside from that username, I am the only user at the site. When logged in as "admin" I cannot delete the other username.
When trying to upgrade automatically to 2.7.1, I get this error: "You do not have sufficient permissions to access this page."
Does anyone know what's happening?