Something is wrong in your WordPress installation.
The screenshot below was taken with all the plugins deactivated and using the default WordPress theme Twenty Sixteen.
https://www.dropbox.com/s/od24aab40bbu2rt/Screenshot%202016-11-01%2010.48.56.png?dl=0
The WordPress Tinymce Editor is not loading properly, if you notice the editor bar used to add content isn’t loading, without this the page builder also won’t work properly.
My advice is to upload again the latest WordPress version files.
After that is also advised to update all plugins and the Atelier theme.
-Rui