reCAPTCHA v1 Not Working
Google has been notifying users since Nov. 2017 that reCAPTCHA v1 is being retired. If you did not upgrade your old code yet, reCAPTCHA v1 is not working anymore. On March 31, 2018 reCAPTCHA v1 was retired. Users will see a message like this, and your web form will no longer submit.
Your options are to remove reCAPTCHA altogether, or upgrade your code to v2.
Do You need reCAPTCHA?
My philosophy is to keep code as simple as possible to run efficiently and minimize conflicts. I also want to code websites that are as easy as possible for a user to understand and be able to get what they need quickly. While new versions of reCAPTCHA are much less frustrating than old versions of having to key in a distorted phrase, it still adds another step for the user. So if you are not/were not having problems with spam I would not suggest to use it for the sake of using it. When a client says want this implemented I will usually suggest a more subtle approach like, server side validation of data and adding a honeypot. This will block spam transparently – the user will not see or have to do anything.
If you need reCAPTCHA v1 upgraded or removed, get in touch. I can fix this or any other problem with your website forms.