My wallpaper never changes

[Timothy Murphy]

I'm running Fedora-20/KDE.
I have had the same - quite nice - wallpaper for a month or so.
When I right-click on this, and go to Default Desktop Settings,
I read
  Layout: Default Desktop
  Wallpaper: Picture of the Day
  Source: Flickr Picture of the Day

What am I failing to do?
(What is that film where the day never changes?)

-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin 2, Ireland