After trying the default oxwall captcha (did nothing to keep spammers out) smart captcha (which showed a broken link, no image file or text), paying for the anti-spam plugin, and even editing a file through cpanel to change the login page address, I finally found this plugin and solved my spam problem. It took two minutes to set up, the captchas are easily readable, and I have had NO spam users in the past two days. Thank you, thank you, for making this plugin. I was able to record a Firefox macro to delete the 13,000 spam users I had accumulated page by page, and my site is now usable again.