I installed and activated the plugin (version 1.2.1) today from the WP-plugin interface.
In the Private! configuration page I get several messages like below.
The plugin seems to be working fine though.
Warning: Missing argument 8 for xfw::form_row(), called in /volume1/www/wp_proj/wp-content/plugins/private-wordpress-access-control-manager/lib/xfw_private.class.php on line 399 and defined in /volume1/www/wp_proj/wp-content/plugins/private-wordpress-access-control-manager/lib/xfw.class.php on line 44.