In backend Entries > 'page-name' I could only see the left nav side bar, and the top "header" bar (breadcrumbs + page name + save button), when ever there was a Matrix field on the page.
I noticed that the last line rendered (marked in blue) had a height of 0, so I started poking around in the CSS.
After disabling a
display: none; (marked in green below) for the div immediately below the last div shown, I could see part of the page plus the error message shown in the screenshot below.
To me, it looks like some "endless" recursion error.
Does anyone have any idea on what might be going on here?
Thanks in advance for any light you might shed on this!
Edit: added the top screenshot to show what the page looked like before I changed the CSS.