I fixed it for me with a workaround.
In wp-config.php I added these lines:
if (strpos($_SERVER['REQUEST_URI'], 'wp-admin') !== false){
define('CONCATENATE_SCRIPTS', false );
}
Maybe it’s not really a solution, but the media lightbox shows up again.
Regards
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This reply was modified 4 years, 9 months ago by
Oliver.