Contact Form 7 issue

Hi, when I have Security plugin activated, the Contact Form 7 does not submit the form, but just loading is spining indefinatlly.
It’s works when Im loged into the website as Admin with plugin activated and works for guest user with plugin Deactivated.
I have deActivated the Security plugin at the moment, as there are Google compaign in progress and form need to be working. I will be “playing” later this evening.
But if you might know what Settings in Security plugin might causing this problem, please let me know. Thank you!