Unable to use editor

Hello, I am unable to use Cornerstone or Visual Composer to edit site. Visual Composer never loads and Cornerstone gives me a Page Not Found error.
url: http://ambiencejazz.com/
thanks, George

Hello There,

Thanks for writing in! Can you confirm that you are fully updated? (Theme and Plugins)
Our latest versions are:
X Theme: 5.1.1
Cornerstone: 2.0.6

You can find the latest version numbers here: (http://theme.co/changelog/) Then you can compare them to what’s installed on your site. If you find anything to be out of date, you can review our update guide.

Are you using CloudFlare or may have installed a caching plugin like W3 Total Cache or WP Super Cache? Please keep in mind that after doing every updates, always remember to clear all caches when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.

Please let us know how it goes.