Hi David, it’s due to the fact that wordpress 3.9 was released with the version 4.0 of TinyMCE editor. We are working to provide an update to accommodate this version in the next couple of days. Thank you.

Hi,

If you run Wordpress 3.9 plz update the theme to the latest version.

We've recently released a version fixing this issue.

Thank you.

Hi Max,

Try refreshing the Add/Edit page you may be seeing cached javascript content.

If you still don't see the button, create a private ticket with your admin credentials to WP dashboard.

Thanks