Thanks for the updated credentials. I've logged in successfully, went to the WordPress editor and I saw the Visual Composer interface was not loaded. I then fired up the console to see what errors are generated and I saw a JS error.
The JS error is coming or at least related to the WordPress core and not from X. The usual cause of that is corruption during WordPress core update or just updates in general.
Please try reinstalling WordPress by going to Dashboard > Updates and click the Re-install Now button.
If that does not work, we'd like to double check on the troubleshooting steps @Prasant provided. I'd recommend that you setup a staging site though and copy your live site to it and give us staging WordPress Admin and FTP access. The main benefit of doing that is we can troubleshoot without disrupting the operation of your live site. If you're not familiar with setting up a staging site, please visit the guide below: