I have CiviCRM version 5.7.0 installed on WordPress 4.9.8. WordPress is using a child theme of Divi 3.17.1.
The website is transitioning from Drupal to WordPress so this install is in a sandbox which is setup as a sub-domain (not on the same server as the live Drupal site). Resource URLs appear to be right.
I get a CiviCRM button on my WP pages which takes me to the Insert CiviCRM Content where I can select "Event Page" and then the appropriate event. However I do not see an insert button on the Insert CiviCRM Content page. Here is a screenshot of what I am referring to:
I have deactivated all of the plugins and have changed the theme to Twenty Seventeen with no results. I also have no JS errors in the console. I'm stuck as to what to try next.