i experience the same issue. I have uploaded GeoLite2-City.mmdb to apps/common/data/maxmind I also enabled the plugin, and then in settings set the plugin to "enabled', and also enabled all available logging events.
Still it shows an empty page. I also checked application.log, but it doesnt show any errors.
Hello, i investigated a bit: mw-campaign_track_open database table - column location_id is always NULL. Although the IP column is filled with an google-proxy IP, because the target email-address was a gmail address. Is there a known problem for that ?