When I click edit with cornerstone - I get this - 
It only happened when I updated cornerstone today via the plug-in menu. Until then it was working fine
Hi,
This is most likely to happen if you have an old version of wordpress.
Please make sure you have the latest version of wordpress, theme and plugins.
The latest version numbers as of now are
Wordpress 4.9.8
Pro 2.3.8,
X 6.3.8,
Cornerstone 3.3.8
Remember to clear all caches when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Hope that helps
Thank you so much. I do need to update my wordpress, so will do this now.
You’re welcome!
Updated wordpress and all my plugins - works great again. 
(very happy smile here)
Great News!
Thanks for letting us know that the the updates has worked for you.
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