Media Library not showing images when adding to Posts (but retrieving image info via ajax)

In case any poor soul runs in to something similar, I’ve found the problem:

define('WP_DEBUG', false);

Running debug mode (as I do on all dev sites), was throwing a warning, but it was being returned in the ‘admin-ajax.php’ which was preventing the images from showing/uploading and returning the appropriate values etc.

I cannot believe the answer to debugging was to stop debugging. Jesus.

I’m away to file a bug report now.

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