Doesn't working on "Lost Password" form Xenforo default theme using latest xenforo version. It just shows an empty field for validation. Unfortunately I cannot use this product if it won't show up on the Lost Password form.
Best Anti-Spam system yet. reCAPTCHA is by-passable compared to this. Only get about 1 Spam bot every other day. I wish this would work on the password reset page though.
I love this Captcha. I've got it installed on all my sites I run. The guys @ KeyCaptcha are also mega helpful, and very quick to respond to any questions.