I also believe there is a bug with the latest PRO v5.2.0. Besides hiding its own meta boxes, it’s also hiding the meta boxes from other plugins. In my case, it was hiding the Events Organizer meta boxes(event details). I had to keep going to the “Screen Options” to show the events meta boxes again. I went back to v5.1.9.1 and fixed the problem. I hope that is fixed in the next release as I hate to keep using outdated plugins.
