From March 2018, Google’s very popular ReCaptcha V1 will be shut down. Visitors will get a message saying “reCAPTCHA V1 IS SHUTDOWN”.
This is of particular interest to CubeCart site owners, because there is often no clear pathway to upgrade for them.
For other users, an upgrade to a more recent version of ReCaptcha is needed. Please see https://developers.google.com/recaptcha/docs/versions#v1 for more information.
If you are running a CubeCart site, and need to update to a WordPress site to help avoid ongoing issues like this, that are caused when software that is not in your control is updated, please go to this page.