Icons dragged to favorites or desktop become invalid

[Olaf Lenz]

Binary package hint: kdebase-workspace

I'm using Kubuntu intrepid beta, recently updated.

I want to put an application (icon) from the application launcher "Applications" tab to the "Favorites" or to the Desktop - either via Drag&Drop or via the context menu. In many cases, the entries in the "Favorites" do work, but the icons are missing (the spiked wheel is shown instead). In other cases, they seem to work (e.g. Konsole, System Monitor, ...). Even worse, when I put the applications on the desktop, the icon is missing (spiked wheel again), and it is inoperative. When I click it, a Kate session opens.

The problem seems to affect only applications that have their desktop files in the directory /usr/share/applications (like Firefox, Thunderbird, etc.), while apps that have a desktop file in /usr/share/applications/kde4 or /usr/share/applications/kde work fine.

I have watched
  .kde/share/config/plasma-appletsrc
and it seems, that the url given for the desktop files is broken. While for the working icons, the Url is
  Url=file:///usr/share/applications/kde4/ksysguard.desktop
for the inoperative icons it is
  Url=firefox.desktop

When I kill plasma, manually fix the entry in plasma-appletsrc, and restart plasma, the icons work.