That seemed to do it! Thank you.
I deleted the uploads folder (there was nothing in it), recreated the uploads folder, and made the permissions 777. Now it works.
Again, thank you all.
Could it be a field leftover in a database table that needs to be updated?
I don’t know where “/var/www/vhosts/” comes from in the address. The rest is right, except for the “/2009/03”. I manually added the folders “/2009/03” to uploads, but the loading still doesn’t work.
I’ve also FTP’d photos into the uploads and the /2009/03 folders, but they do not appear in the WP Media Library.
All permissions are set to 777. I have no plugins at all.