Large parts of pages on my website are missing following installing an update to the latest version earlier today. Editing in Cornerstone shows the following error:
Undefined Element: This element could not render because its definition is missing. You might need to activate a plugin.
All required plugins are activated and fully up to date. I have tried disabling plugins to no avail.
Wordpress Version - 5.6.1
X version - 8.1.5
Cornerstone - 5.1.5