Sorry, I didn’t realise the original post was regarding a specific theme. I thought it was about this math_captcha field not showing up in general.

My comment may still apply — I don’t know what the commenting system of appTheme is like (but based on http://docs.appthemes.com/action-hooks/appthemes_page_comments_form/ it looks like it’d suffer the same problem: It calls the older do_action(‘comment_form’) instead of the newer comment_form())