To improve security, I decided to change the database prefix for our wordpress installation from wp_ to our custom code.
Everything works well, except that for the WordPress sites in subfolders, the featured image thumbnails have disappeared. The images are still there on the server, in the ‘blogs-dir’ folder. The thumbnails are still there in the main blog.
When I try to open the images in the backend, there is no thumbnail there, but when I click ‘edit image’, the image appears. So WordPress definitely can find the images.
Any idea how to fix this?
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