I’ve attempted to. I click the box, it goes green (“On”), then I click Save Settings. When I reload the Settings page, the box shows “Off”.
The PluginOrganizerMU.class.php was already in the /mu-plugins folder when I looked. I did not copy it there. I assume that this happened on installation? It is the same size as the one in /lib (17,526 bytes)
I now see the Plugin Organizer when editing a Page, but I don’t think it’s working. I’ve looked at the Page Source, and plugins are being loaded that are not in the Group that I set up.