Public bug reported:

Binary package hint: kdebase-workspace

While I initially observed this bug on my Desktop PC running Kubuntu
10.04 + backported KDE 4.5.1 I am now able to reproduce it using the
10.10 release candidate running inside a VirtualBox VM. This rules out a
graphics-driver-related issue.

>From time to time, after logging into my KDE session, the shadow that is 
>usually drawn behind the Plasma Panel at the bottom of the screen appears 
>detached from the panel in the upper left quadrant of the screen. My panel is 
>set to auto-hide and the shadow appears and disappears when the panel shows 
>and hides. To temporarily correct the issue (until the ghost shadow decides to 
>show
up again), either change the panel alignment from "Center" to "Left" to 
"Center" (but I guess any alignment change will do) or log off and log on again 
(while the latter comes with a certain probability that the issue will 
immediately pop up again).

When inspecting the list of existent windows, one can actually spot a
window, the dimensions of which correspond to the dimensions of the
shadow.

For an example, refer to the screenshot at:
http://archive.ginkel.com/kde/snapshot-plasma-ghost.png

The issue has already been reported upstream:
http://bugs.kde.org/show_bug.cgi?id=251537

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: kdebase-workspace 4:4.5.1-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
Date: Fri Oct  1 22:10:17 2010
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 
(20100928.3)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kdebase-workspace

** Affects: kdebase
     Importance: Unknown
         Status: Unknown

** Affects: kdebase-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug maverick

-- 
Panel puts ghost shadow on Desktop
https://bugs.launchpad.net/bugs/653242
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