Something strange has happened to our Cornerstone content. I think this may have occurred with the most recent X/Cornerstone update.
The page listing now shows “0” Cornerstone pages:

When I click to open a page, it no longer warns that this is a Cornerstone page (with a button to edit in Cornerstone). Now it simply opens in the text editor. In addition, the Cornerstone tab has disappeared and the Visual tab does not respond at all.

I can still open a Cornerstone page by clicking “edit with Cornerstone”.

If I go to X > Cornerstone, all the content still seems to be there and I can edit a Cornerstone page.

But the Cornerstone content is not appearing correctly in the Wordpress main post/page view. Any idea what’s going on? I have to build several pages and I’m now worried the content won’t be saved properly.

