Events do not appear in events section

I have done some testing with my own PIWIK instance and I have been able to register Events using:
_paq.push([‘trackEvent’, ‘Documentary’, ‘Play’, ‘Thrive’]);

Now I am using another instance but I am not able to save the events. If I open the “Visitor log” I see that the events are being registered:

Spent a total of 44 min 38s on the website, and performed 9 actions (6 Pageviews, 3 Events) in 1 visits.

But the list is empty if I open Actions->Events->Event names (There is no data for this report.)

Could anybody help me?

Thank you