Like your plugin. Thanks for a great contribution to WordPress.
I've encountered a small issue where the plugin won't work if a specific setting in the White Label CMS plugin in enabled.
White Label CMS allows for a setting that redirects http://www.yourdomain.com/login to the wp-login.php file. If this setting is enabled and you activate Rename wp-login.php using the default settings, you will be locked out of your site. So if you are using White Label CMS, make sure to disable that setting.