I get this error: 
I have PHP 7.0.
Hi There @shannonrenner
Thanks for writing in! The latest version of X theme is v6.5.6 and the latest version of Cornerstone is v3.5.5 as you can see here on our version information here (https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195). You need to update both X theme and Cornerstone plugin in-order to avoid any incompatibility issues. You can refer to our update guide here (https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62).
If you’re getting the same error 400 error after updating, please review the following resource (https://www.lifewire.com/how-to-fix-a-400-bad-request-error-2617988).
Also it could be due to your mod_security restrictions as well which is server related. You can read more information from here (https://theme.co/apex/forum/t/edit-preview-issue/58510/15?u=mldarshana).
If you’re still having issues, please provide us with your WordPress login credentials in a secure note to check your issue further.
Thanks!
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