Thanks for asking.
Please try out following solutions and see if you are able to validate.
- Please make sure that you are using latest version of X Theme (6.3.3) and Cornerstone (3.3.8).
- Please take a look at the solution mentioned in following article:
If you still have problems kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case.