I am also having this issue (images won’t load from /wp-admin/upload.php in Grid view but do load in List View)–I switched to the Twenty Nineteen theme, deactivated all plugins (fixing the issue) and then activated only ACF Pro Version 5.8.2 and the problem returned. No errors in the js console or in server logs, just won’t load images and shows the wheel spinning indefinitely. I think I’ve used the most recent version of ACF Pro on other installs without a problem, so I can’t figure out what could be different. Any ideas?
WordPress 5.2.2 with all other plugins deactivated, with up-to-date Twenty Nineteen theme.
