Some server configuration parameters not working on sitestats tool

I have tested some server configuration parameters in relation with sitestats tool, and several of them are not working.

When you enable these two parameters, the sitestats view should show a widget with the average spent time by users on the site:

display.users.present=true
enableSitePresences@org.sakaiproject.sitestats.api.StatsManager=true

But nothing is shown, as if these parameters were still false.