Version:            (using KDE 4.2.0)
OS:                Linux
Installed from:    Ubuntu Packages

Closing Dolphin via the window button, it crashed and threw the following backtrace (I searched for some keywords but this appears to be unfiled):

[KCrash Handler]
#5  0x00007fb48e00e2b7 in WindowTaskItem::setAdditionalMimeData (this=<value optimized out>, mimeData=0x2045730) at /build/buildd/kdebase-workspace-4.2.0/plasma/applets/tasks/windowtaskitem.cpp:298
#6  0x00007fb48e016a7a in AbstractTaskItem::mouseMoveEvent (this=0x2124c90, event=0x7fffb1fee010) at /build/buildd/kdebase-workspace-4.2.0/plasma/applets/tasks/abstracttaskitem.cpp:287
#7  0x00007fb4a616abce in QGraphicsItem::sceneEvent () from /usr/lib/libQtGui.so.4
#8  0x00007fb4a618a4d6 in ?? () from /usr/lib/libQtGui.so.4
#9  0x00007fb4a6191ba1 in QGraphicsScene::mouseMoveEvent () from /usr/lib/libQtGui.so.4
#10 0x00007fb4a6191e40 in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#11 0x00007fb4a5c4fc3d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#12 0x00007fb4a5c579ba in QApplication::notify () from /usr/lib/libQtGui.so.4
#13 0x00007fb4a823d3eb in KApplication::notify (this=0x118b190, receiver=0x12a3a60, event=0x7fffb1fee010) at /build/buildd/kde4libs-4.2.0/kdeui/kernel/kapplication.cpp:307
#14 0x00007fb4a552bd61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#15 0x00007fb4a619dc70 in ?? () from /usr/lib/libQtGui.so.4
#16 0x00007fb4a61a2f3e in QGraphicsView::mouseMoveEvent () from /usr/lib/libQtGui.so.4
#17 0x00007fb4a5ca2196 in QWidget::event () from /usr/lib/libQtGui.so.4
#18 0x00007fb4a619f9cb in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#19 0x00007fb4a552b038 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#20 0x00007fb4a5c4fc0c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#21 0x00007fb4a5c5822a in QApplication::notify () from /usr/lib/libQtGui.so.4
#22 0x00007fb4a823d3eb in KApplication::notify (this=0x118b190, receiver=0x1bfdd20, event=0x7fffb1fee910) at /build/buildd/kde4libs-4.2.0/kdeui/kernel/kapplication.cpp:307
#23 0x00007fb4a552bd61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#24 0x00007fb4a5c575c8 in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#25 0x00007fb4a5cbbbe9 in ?? () from /usr/lib/libQtGui.so.4
#26 0x00007fb4a5cba607 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#27 0x00007fb4a5ce22c4 in ?? () from /usr/lib/libQtGui.so.4
#28 0x00007fb4a06efd3b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#29 0x00007fb4a06f350d in ?? () from /usr/lib/libglib-2.0.so.0
#30 0x00007fb4a06f36cb in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#31 0x00007fb4a555415f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#32 0x00007fb4a5ce1a6f in ?? () from /usr/lib/libQtGui.so.4
#33 0x00007fb4a552a682 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#34 0x00007fb4a552a80d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#35 0x00007fb4a552ccbd in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#36 0x00007fb4a9b8c66b in kdemain (argc=1, argv=0x7fffb1fef9b8) at /build/buildd/kdebase-workspace-4.2.0/plasma/shells/desktop/main.cpp:54
#37 0x00007fb4a48d9466 in __libc_start_main () from /lib/libc.so.6
#38 0x00000000004007c9 in _start ()