Does the built-in quiz not work for you, or have you not tried it yet? I’m still just getting my site started, but when I first started using Easy Captcha, everything looked great. I installed Contact Form 7 and no longer see the captchas. When I entered test comments, I just got the message “Please try to submit the form again” from wp-comments-post.php. I think I installed my new theme around the same time though, so it might have something to do with that. I’m using Flexibility 3.