I just went into my plugins page (Settings > Plugins) and found the note that the ‘Referers’ plugin was not compatible. Apparantly there is a new plugin called ‘Referrers’ (double r) that replaces it.
I’ve activated it, and all my reports are back.
I would be grateful for some hints as to what changed here, though? Just curious.
we simply renamed the plugin name to fix the typo in the plugin name. Normally the new one should have been activated automatically, but it may fail for some reasons