Renamed plugin folder and when I changed back nothing was activated

Typically when you visit the actual plugins page in admin with the folder renamed it will detect this and deactivate missing plugins by updating the active_plugins option… otherwise it will leave the option intact and unchanged. At least on single site, I am not fully sure on multisite if anything else triggers this update.

However if you have a backup of your database, you should be able to retrieve the active_plugins option and reapply it through say phpMyAdmin. Again this may be different for multisite (though I don’t think it is, just doing it for the correct table should be all you need.)

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