Wrong canonical link on wp-admin pages
wp-admin-canonical is broken, as it assumes how WordPress is installed. there was a plugin to fix it, but the plugin was removed from the plugin repository apparently. It is still on github and pluginmirror though: https://github.com/wp-plugins/remove-wp-canonical-url-admin-hack http://www.pluginmirror.com/plugins/remove-wp-canonical-url-admin-hack/