tries to load
> Not Found
> The requested URL /security/wp-content/plugins/simpleCAPTCHA/gdimg.php was not found on this server.
resulting in a comment form that asks for a "security code" but does not show a captcha image.
Submitting a comment without a captcha takes me to
which is a blank page. (This might be a separate bug.) But at least it puts my comment into moderation.