Version:           kde4daily version from 27th May (using Devel)
Installed from:    Compiled sources

I'm testing the kde4daily inside qemu.
Updated yesterday.

I cannot reproduce this bug,
I guess it might be caused by bad timig.

I fiddled around the border of the default desktop floder view applet, tying to close it, accidently opened the desktop context menu and then finally got hold of the applet's close button. Not sure what state the desktop context menu was in (most probably gone).

Anyway, here is the backtrace:

Programma: Plasma darbvirsma (plasma), signāls SIGABRT
[Thread debugging using libthread_db enabled]
[New Thread 0xb56cb720 (LWP 5135)]
[New Thread 0xb2e72b90 (LWP 5148)]
[New Thread 0xb3cc8b90 (LWP 5139)]
[KCrash handler]
#6  0xb7f0f410 in __kernel_vsyscall ()
#7  0xb5abb085 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb5abca01 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb667d895 in qt_message_output ()
   from /home/kde4daily/install/qt-copy/lib/libQtCore.so.4
#10 0xb667d919 in qFatal ()
   from /home/kde4daily/install/qt-copy/lib/libQtCore.so.4
#11 0xb667dd71 in qt_assert ()
   from /home/kde4daily/install/qt-copy/lib/libQtCore.so.4
#12 0xb7e2cb59 in QList<Plasma::Applet*>::first (this=0x8111bfc)
    at /home/kde4daily/install/qt-copy/include/QtCore/qlist.h:252
#13 0xb7e25400 in Plasma::Containment::keyPressEvent (this=0x8112158, 
    event=0xbf8e5384)
    at /home/kde4daily/src/kdebase/workspace/libs/plasma/containment.cpp:764
#14 0xb64290fb in QGraphicsItem::sceneEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#15 0xb645b417 in QGraphicsWidget::sceneEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#16 0xb6433b5d in QGraphicsScenePrivate::sendEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#17 0xb6433d6f in QGraphicsScene::keyPressEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#18 0xb643d815 in QGraphicsScene::event ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#19 0xb5e7081d in QApplicationPrivate::notify_helper ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#20 0xb5e70b03 in QApplication::notify ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#21 0xb7036b57 in KApplication::notify (this=0x805a408, receiver=0x80e9dc0, 
    event=0xbf8e5384)
    at /home/kde4daily/src/kdelibs/kdeui/kernel/kapplication.cpp:311
#22 0xb677c68a in QCoreApplication::notifyInternal ()
   from /home/kde4daily/install/qt-copy/lib/libQtCore.so.4
#23 0xb7752c1b in QCoreApplication::sendEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtWebKit.so.4
#24 0xb644a109 in QGraphicsView::keyPressEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#25 0xb5ece1d4 in QWidget::event ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#26 0xb623bf4c in QFrame::event ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#27 0xb62d4319 in QAbstractScrollArea::event ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#28 0xb644a892 in QGraphicsView::event ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#29 0xb5e7081d in QApplicationPrivate::notify_helper ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#30 0xb5e70e1d in QApplication::notify ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#31 0xb7036b57 in KApplication::notify (this=0x805a408, receiver=0x811c770, 
    event=0xbf8e5384)
    at /home/kde4daily/src/kdelibs/kdeui/kernel/kapplication.cpp:311
#32 0xb677c68a in QCoreApplication::notifyInternal ()
   from /home/kde4daily/install/qt-copy/lib/libQtCore.so.4
#33 0xb5e7c669 in QCoreApplication::sendSpontaneousEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#34 0xb5edb43a in qt_sendSpontaneousEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#35 0xb5f1563c in QKeyMapper::sendKeyEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#36 0xb5f1699c in QKeyMapperPrivate::translateKeyEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#37 0xb5eec952 in QApplication::x11ProcessEvent ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#38 0xb5f18ef1 in x11EventSourceDispatch ()
   from /home/kde4daily/install/qt-copy/lib/libQtGui.so.4
#39 0xb593bbf8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#40 0xb593ee5e in ?? () from /usr/lib/libglib-2.0.so.0
#41 0x08062498 in ?? ()
#42 0x00000000 in ?? ()
#0  0xb7f0f410 in __kernel_vsyscall ()