I added a captcha to my form, but the captcha image won't display!
There are several possible reasons why the captcha doesn't show up for some users.
A) Are you using Akeeba Admin Tools, by any chance? If so, please try this suggestion we received from another user:
In Akeeba Admin Tools the following Exceptions have to be put in:
components/com_breezingforms/images/captcha/securimage_show.php
components/com_breezingforms/images/captcha/securimage.php
B) The most common is missing True Type Font (TTF) support with your PHP installation.