Compatibility with SiteOrigin Page Builder

All was well until about a week ago (sorry, I can’t tie it down to a specific event like a plugin update). Now, when I am logged in as Admin, most content on my home page is not showing – just a few headings. The page, built with Site Origin Page Builder contains Visual Elements and Site Origin Heros. However it does show correctly when I am logged out or in an incognito / private window. I have cleared all caches. When I deactivate the Black Studio TinyMCE Widget plugin, the page shows okay as Admin, but, as expected, I cannot make any edits to the Visual Elements due to the missing plugin.

Any ideas so I can continue to make edits to this page please?

Thanks!