Reply To: API not sticking
2015-11-11 at 18:04 #382
Deprecated: wp_make_content_images_responsive is deprecated since version 5.5.0! Use wp_filter_content_tags() instead. in /nfs/c09/h02/mnt/138233/domains/s2member.net/html/wp-includes/functions.php on line 4773
Interestingly, that IS working. On both problematic sites.
Strange that it never did that before. So there might still be a need to investigate to know why it happened in the first place.