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I was trying to add new images from Media (which I’ve done lots of times) but suddenly there is nothing at all on the Edit page. It is the same now for all my Galleries.
It occurred as I was trying to add latest multi-selected content from Media, which I’ve always had success with.
The actual Gallery displays correctly on the URL up front page. screen for all FooGalleries.
If I copy the shortcode to a new Page it works perfectly.
If I go to Add New Gallery, and import images from Media, I get the same blank screen.
I cannot compare the settings for my other galleries as it is still the same blank screen.