post@medicor.no on "No images show when clicking Add Media"

I have uploaded images via Media Library – Add New, and they show there. But when in a page, and want to insert an image, and click on Add Media, NO images are showing. No matter what I click on. I have tried to deactive all plugins, except Wordpress CEO. It did not work. I also inserted the command
define('CONCATENATE_SCRIPTS', false ); to wp-config.php
that I found in another thread, and which helped in that case. But it did not help me. I can insert images via Text, but cannot use some automatic funtcions (blog photo automatic size), or create slides when I can’t access images via Add Media. Any suggestions?