Worked great until I upgraded my sites to WP 3.7 using ManageWP. When I went back to check things out, only the 4 sites that had Plugin Organizer were impacted. White screen and nothing else. Unable to access the WP dashboard.
I renamed the Plugin Organizer folder. Still had a white screen. Renamed the mu-plugins folder and I was back in business. (But without the use of Plugin Organizer, of course.)
I'll be eagerly waiting for this indispensable plugin to be updated to work with WP 3.7!