Version:            (using KDE 4.1.3)
Compiler:           Mandriva Linux 2009.0 Powerpack 64-bit
OS:                Linux
Installed from:    Mandriva RPMs

We have several user logins on one PC.  The desktop for one user has crashed several times, to the point of disappearing (not even a cursor).  I moved the kde4 folder for this user, logged in, made some minor changes (configured date, Klipper...), and set a picture as desktop wallpaper.  Logged out and back in - the picture loaded OK, panel OK. Clicked on the Mandriva menu and got a fatal error:
"The application Plasma Workspace (plasma) crashed and caused the signal 6 (SIGABRT)."
There were no documents loaded, nor apps running.  The desktop was almost competely fresh.  In the next few minutes I ran Konqueror and KWrite, and selected other menu items without a crash.

I saved the backtrace, logged out and back, clicked on the menu once the desktop had loaded, and the error was reproduced exactly - the backtraces are the same.  The desktop seems usable, but since this has happened repeatedly in the past few days, I suspect it may disappear completely on logging in again after a few more changes.

Backtrace:

Application: Plasma Workspace (plasma), signal SIGABRT
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0x7f13b8b42700 (LWP 15140)]
[New Thread 0x4188d950 (LWP 15142)]
[New Thread 0x40df3950 (LWP 15141)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[KCrash handler]
#5  0x00007f13b83fc955 in raise () from /lib64/libc.so.6
#6  0x00007f13b83fe183 in abort () from /lib64/libc.so.6
#7  0x00007f13b843ef60 in ?? () from /lib64/libc.so.6
#8  0x00007f13ab297d26 in ?? ()
   from /usr/lib64/kde4/plasma_applet_mandrivalauncher.so
#9  0x00007f13ab295604 in ?? ()
   from /usr/lib64/kde4/plasma_applet_mandrivalauncher.so
#10 0x00007f13ab296ea5 in ?? ()
   from /usr/lib64/kde4/plasma_applet_mandrivalauncher.so
#11 0x00007f13ab2c1e82 in ?? ()
   from /usr/lib64/kde4/plasma_applet_mandrivalauncher.so
#12 0x00007f13ab2c5946 in ?? ()
   from /usr/lib64/kde4/plasma_applet_mandrivalauncher.so
#13 0x00007f13ab2c2d98 in ?? ()
   from /usr/lib64/kde4/plasma_applet_mandrivalauncher.so
#14 0x00007f13ab2c3da9 in ?? ()
   from /usr/lib64/kde4/plasma_applet_mandrivalauncher.so
#15 0x00007f13b7356c34 in QMetaObject::activate ()
   from /usr/lib64/libQtCore.so.4
#16 0x00007f13b811116f in Plasma::Icon::pressed ()
   from /usr/lib64/libplasma.so.2
#17 0x00007f13b81134a6 in Plasma::Icon::mousePressEvent ()
   from /usr/lib64/libplasma.so.2
#18 0x00007f13b63ab2c6 in QGraphicsItem::sceneEvent ()
   from /usr/lib64/libQtGui.so.4
#19 0x00007f13b63ca1d6 in ?? () from /usr/lib64/libQtGui.so.4
#20 0x00007f13b63d2d90 in ?? () from /usr/lib64/libQtGui.so.4
#21 0x00007f13b63d1b30 in QGraphicsScene::event ()
   from /usr/lib64/libQtGui.so.4
#22 0x00007f13b5e90a2d in QApplicationPrivate::notify_helper ()
   from /usr/lib64/libQtGui.so.4
#23 0x00007f13b5e987ba in QApplication::notify ()
   from /usr/lib64/libQtGui.so.4
#24 0x00007f13b7c5851b in KApplication::notify ()
   from /usr/lib64/libkdeui.so.5
#25 0x00007f13b734285f in QCoreApplication::notifyInternal ()
   from /usr/lib64/libQtCore.so.4
#26 0x00007f13b63dd71d in QGraphicsView::mousePressEvent ()
   from /usr/lib64/libQtGui.so.4
#27 0x00007f13b5ee30cf in QWidget::event () from /usr/lib64/libQtGui.so.4
#28 0x00007f13b63df71b in QGraphicsView::viewportEvent ()
   from /usr/lib64/libQtGui.so.4
#29 0x00007f13b7341b38 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib64/libQtCore.so.4
#30 0x00007f13b5e909fc in QApplicationPrivate::notify_helper ()
   from /usr/lib64/libQtGui.so.4
#31 0x00007f13b5e9901c in QApplication::notify ()
   from /usr/lib64/libQtGui.so.4
#32 0x00007f13b7c5851b in KApplication::notify ()
   from /usr/lib64/libkdeui.so.5
#33 0x00007f13b734285f in QCoreApplication::notifyInternal ()
   from /usr/lib64/libQtCore.so.4
#34 0x00007f13b5e983c8 in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib64/libQtGui.so.4
#35 0x00007f13b5efc949 in ?? () from /usr/lib64/libQtGui.so.4
#36 0x00007f13b5efb3a7 in QApplication::x11ProcessEvent ()
   from /usr/lib64/libQtGui.so.4
#37 0x00007f13b5f21f84 in ?? () from /usr/lib64/libQtGui.so.4
#38 0x00007f13b172c8d2 in g_main_context_dispatch ()
   from /usr/lib64/libglib-2.0.so.0
#39 0x00007f13b173005d in ?? () from /usr/lib64/libglib-2.0.so.0
#40 0x00007f13b173021b in g_main_context_iteration ()
   from /usr/lib64/libglib-2.0.so.0
#41 0x00007f13b736abff in QEventDispatcherGlib::processEvents ()
   from /usr/lib64/libQtCore.so.4
#42 0x00007f13b5f2172f in ?? () from /usr/lib64/libQtGui.so.4
#43 0x00007f13b7341182 in QEventLoop::processEvents ()
   from /usr/lib64/libQtCore.so.4
#44 0x00007f13b734130d in QEventLoop::exec () from /usr/lib64/libQtCore.so.4
#45 0x00007f13b73437bd in QCoreApplication::exec ()
   from /usr/lib64/libQtCore.so.4
#46 0x00007f13b87457b3 in kdemain () from /usr/lib64/libkdeinit4_plasma.so
#47 0x00007f13b83e9316 in __libc_start_main () from /lib64/libc.so.6
#48 0x00000000004005c9 in _start ()