Comment 45 for bug 338205

I have Kubuntu jaunty installed since alpha5 and I've never hit this bug... until today!
kde splashscreen appears, and then when the plasma-desktop is supposed to appear: black screen
I can use Krunner to launch programs, but sill.. no panel, no widget, no wallpaper, just a black screen.
I've done my last jaunty upgrade before the crash yesterday, so after kdebase-workspace (4:4.2.2-0ubuntu1) was uploaded

with that fix :

   * Add kubuntu_72_remove_startkde_cruft.diff to remove test for a setting in
     kcmrandrrc that doesn't exist anymore. (KDE expects krandrtray to handle
     resolution setting on startup now...)

could it be the cause ?

I've tried to remove plasma-appletsrc and plasmarc and then restart the computer :
after the restart, the plasma-desktop appears for a few seconds, and then the black screen comes back.

I have a nvidia 5700 ultra graphic card btw.