Today I upgraded to version 18.104.22.168 but now I am not able to manage any of my plugins. When I click on 'Manage' from the admin panel for any of my plugins including Announce from the Dashboard, it returns nothing. The page remains the same. It seems that your last upgrade is some kind of blocking the plugin-editor.php and disallowing 'Manage' buttons to work. I tried to disactivate the plugin and try again but nothing changed, I'm still not able to manage any of my plugins. Any ideas?