What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Did you install the JotForm plugin on your Wordpress site and when you update the Wordpress site to 4.0.1 the form is not visible? if so, please try re-install the plugin and re-embed your form, maybe that should help to resolve the issue.
I have had 4.0.1 since it came out, so it was already updated prior to installing the plugin. I still am unable to use the plugin or manually insert the code to get it to work.
The plugin gives me a pencil in the editor, but nothing happens when I click it.
I have already answered you on the following thread: http://www.jotform.com/answers/475423-Adding-to-Wordpress-