I am trying to add a captcha field to a new user registration form (see hidden link)
The Captcha does not display, and when submitting the form it throws and error saying 'Missing CAPTCHA'
I have tried creating a new form and a new page but this did not solve the issue.
I have tried with both CAPTCHA v2 and v3 credentials but this did not solve the issue.
I have tried adding the CAPTCHA in both standard and Expert Mode but this did not solve the issue.
I am using the latest versions of the toolset plugins as of 02/10/2019 (yesterday).
I can confirm that the captcha is there on the page but it seems to be hidden somehow.
It could be because of a plugin conflict or the theme. What I recommend that you do is to switch to a default wordpress theme and deactivate all of the non-toolset plugins and check again.
Also I would check to ensure that the Captcha keys are in fact correct for your site url as well.