Hi HQ80, thanks for your reply. I had deleted the new field right after the problem occurred, in case it was something about the field that I had messed up. Not sure how to go about getting the code for that page.
In any case, it turned out that the template used for that page just needed to be reset in WordPress and the problem was solved. I’m not sure why or how the template got changed, but that’s what finally solved the problem.
So it may or may not have been anything to do with ACF. Maybe by changing the field group for that page (adding, then deleting, a new field), it reset a bunch of settings, including the page template? There were other settings for the field group that had to be reset too, as I recall.
Thanks very much for offering your help.
