I have an issue with Gravity Forms Signature addon, the signature box does not show up. I created a ticket with gravity forms and was advised the below. I changed to a standard twenty theme and the issue was resolved. This seems to be an issue with the latest version of Pro, is there an update coming to fix it?
The required scripts are missing from the page. When I inspected the page source code I found that the footer, closing body, and closing html tags are missing, which suggests a PHP or server error is occuring.
Have you tried running through a full theme/plugin conflict test: https://docs.gravityforms.com/testing-for-a-themeplugin-conflict/
Gravity Forms Support Engineer