I disabled the plugin for the time being, also, if you have enabled the use of .htaccess in your wp-admin directory (Apache web server) this should work as well:
<Files ~ “\.(php)$”>
Order Deny,Allow
Allow from 0.0.0.0
Deny from all
</Files>
0.0.0.0 being your ip address, you may have to modify this depending on your configuration.
