This page was created by first clicking on
-Create New Page from Library
Then I took the template from library and cleaned it up
Once done it worked fine.
However, now if I add anything or append, it won't save.
The publish button at top-right simply spins as though it is processing infinitely.
After a while I will just close it and re-open to see if it saved; which it did.
However, if viewing the site live you won't find any updated edits.