Hi,
Seems to be a problem with the email notification setting in WAF config! I've entered all necessary data and when pressing the button Send email test the following message appears:
"Notice
You must provide at least one recipient email address."
I've tried on several different sites but with the same result.
I have just found the reason; I will fix it in the next version as this is not a critical bug.
Meanwhile to solve it just overwrite the file located into /administrator/components/com_securitycheckpro/models/firewallconfig.php with the attached file (unzip it before).
Regards and thank you very much for reporting this,
Jose