I have just purchased the Quform plugin, because it looks like it will perfectly fulfill what I need for one of my customer’s web projects.
I have now activated the plugin and added the first form: simply containing one element: an email address field. Then I have added this to a page using the shortcode, and the result is that nothing is rendered at the page. Not even an empty div or anything.
To check whether it is a problem with the template in use, I installed the same plugin on a locally running page, same problem: nothing rendered. Then, I used a fresh installed WordPress instance, installed the plugin there and it works fine. Afterwards, I installed the theme that I have in use on the live page, and it is still working fine.
Can you give me any hints on how to debug what the problem really is?