Currently working on the site http://****brand.+++nieuwe.++++/
I followed all the instructions of the plugin to make it work together with the forms, but still not able to fix the problem
When a user clicks submit button of a form in a popup there is a message in the dev console "jQuery is not defined". after that the form stops working. The popup can be closed, but to make the form to work again I have to reload the page.
I set the popup script load method to "page footer"
The only way to make the form working for me was to set the ajax to false in Gravity form short code and setting Form submit to "redirect to form target URL" in popup post "Behaviour" settings