Upgrade F16 -> F17 and backgrounds all black (KDE)

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http://forums.fedoraforum.org – Hi, I've just upgraded from 16 to 17 and everything has gone fine as far as I can see except one point. From 16 the upgrade has preserved my 4 workspaces and two panels with all their bells and whistles. However my background is just black (the splash screen shows the Beefy Miracle fireworks, until my workspaces load) and the widgets I had on the background have disappeared. I would normally just reconfigure my backgrounds as I wished, but what is weird is that I have the 'fade' transition when switching and, for the duration of the fade, it displays my old workspace, with the Verne b (HowTos)