Bob Chapman

We have version 2.3.1 of Responsive Lightbox, which should be the latest version according to this thread. I then tried using the current version of jQuery from jQuery Migrate. (Use current in jQuery Migrate, save, delete cache.)

However, the Black Screen with X problem was there when I did that.

I deprecated the jQuery version in jQuery Migrate (Use Legacy 1.12.4-wp in jQuery Migrate, save, delete cache). This solved the problem (again).