I have the same issue. I click add media, and nothing happens. If I go to the media library, nothing shows. I can click an “add new” media button, and once I do, it opens a page with just a weird mode of the media manager, not showing any images, more of a text list. And text mode in the editor does not work.
Also, I went to the plugin editor to update all my plugins, and the “select all” button does nothing.
After manually selecting them all and updating, it looks like the media manager is working again.