Activity Timeline in opportunity

Hello,

I set the Activity Timeline in the opportunity card (overview).

In my example, the opportunity starts the 01.01.2015 and the end date is 31.12.2015

I don't understand the behaviour of the Activity timeline.

Indeed, I see the 01.12.2015 (first day of the current month) and I don't see the close date on the line.

Moreover, when I click on the link "See Complete Timeline" nothing happens.

Can you explain me how it works?

Thanks in advance,

Audrey