For other users of this plugin – as I was going through the next settings I needed to make the following change:
Put this code:
/* INCREASING MEMORY */
define( ‘WP_MEMORY_LIMIT’, ‘128M’ );
in WP-CONFIG.PHP
right before
/**
* WordPress Database Table prefix.
*
Take Care!
Just found out about a conflict between this plugin and OSE Firewall Badge plugin.
That was the reason. Deactivated it and now everything is fine.
Thank you anyway!