Ok, well add me to the list. I have 3 sites that use X and Cornerstone, and now after updating (some even before updates) are not working. What happens is I get the "The preview was unresponsive after loading. This is most often..." screen that comes up, I try again, but then it shows the page with no sections, rows, etc. just he header, and footer at the top of the page.
Please let me know what is going on. I hvae deactivated plugins, cleared browser cache. Like I said I have 3 sites that this is happening too. All 3 have different hosts. I don't have a problem letting Apex Support look at my setup, tell me where to send a private message with my creds