Version:            (using KDE 4.3.0)
OS:                Linux
Installed from:    RedHat RPMs

I noticed a strange misbehaviour of the taskbar plasmoid - there was one "window-title-slot" empty on the left - instead of moving it to the right. (Please see screenshot).

At the moment I took the screenshot, plasma crashed with a segmentation fault:

#6  0x09302a7c in QGraphicsLayoutItem::geometry (this=0x690084) at graphicsview/qgraphicslayoutitem.cpp:664
#7  0x09306710 in QGraphicsWidget::size (this=0x690074) at graphicsview/qgraphicswidget.cpp:336
#8  0x026d34cc in AbstractTaskItem::basicPreferredSize (this=0xa6897c0) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/applets/tasks/abstracttaskitem.cpp:105
#9  0x026cf3cb in TaskItemLayout::preferredColumns (this=0x9cafc60) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/applets/tasks/taskitemlayout.cpp:206
#10 0x026d012b in TaskItemLayout::gridLayoutSize (this=0x9cafc60) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/applets/tasks/taskitemlayout.cpp:222
#11 0x026d01ec in TaskItemLayout::layoutItems (this=0x9cafc60) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/applets/tasks/taskitemlayout.cpp:245
#12 0x026d0d1a in TaskItemLayout::insert (this=0x9cafc60, index=5, item=0xa023e10) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/applets/tasks/taskitemlayout.cpp:125
#13 0x026d0eff in TaskItemLayout::addTaskItem (this=0x9cafc60, item=0xa023e10) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/applets/tasks/taskitemlayout.cpp:82
#14 0x026dd5e2 in TaskGroupItem::itemAdded (this=0x9d7a538, groupableItem=0xa62f758) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/applets/tasks/taskgroupitem.cpp:477
#15 0x026de577 in TaskGroupItem::qt_metacall (this=0x9d7a538, _c=InvokeMetaMethod, _id=29, _a=0xbf9f28a8)
    at /usr/src/debug/kdebase-workspace-4.3.0/i686-redhat-linux-gnu/plasma/applets/tasks/taskgroupitem.moc:113
#16 0x0559451c in QMetaObject::activate (sender=0x9d666e8, from_signal_index=<value optimized out>, to_signal_index=21, argv=0xbf9f2340) at kernel/qobject.cpp:3112
#17 0x05595153 in QMetaObject::activate (sender=0x9d666e8, m=0x650e194, local_signal_index=0, argv=0xbf9f28a8) at kernel/qobject.cpp:3186
#18 0x064f7aa4 in TaskManager::TaskGroup::itemAdded (this=0x9d666e8, _t1=0xa62f758) at /usr/src/debug/kdebase-workspace-4.3.0/i686-redhat-linux-gnu/libs/taskmanager/taskgroup.moc:139
#19 0x064f8525 in TaskManager::TaskGroup::add (this=0x9d666e8, item=0xa62f758) at /usr/src/debug/kdebase-workspace-4.3.0/libs/taskmanager/taskgroup.cpp:138
#20 0x064e03fe in TaskManager::GroupManagerPrivate::addStartup (this=0x9d66650, task=...) at /usr/src/debug/kdebase-workspace-4.3.0/libs/taskmanager/groupmanager.cpp:176
#21 0x064e133b in TaskManager::GroupManager::qt_metacall (this=0x9d77cc0, _c=InvokeMetaMethod, _id=12, _a=0xbf9f2a98)
    at /usr/src/debug/kdebase-workspace-4.3.0/i686-redhat-linux-gnu/libs/taskmanager/groupmanager.moc:106
#22 0x0559451c in QMetaObject::activate (sender=0x9d66e48, from_signal_index=<value optimized out>, to_signal_index=6, argv=0xbf9f2340) at kernel/qobject.cpp:3112
#23 0x05595153 in QMetaObject::activate (sender=0x9d66e48, m=0x650e35c, local_signal_index=2, argv=0xbf9f2a98) at kernel/qobject.cpp:3186
#24 0x064fb524 in TaskManager::TaskManager::startupAdded (this=0x9d66e48, _t1=...) at /usr/src/debug/kdebase-workspace-4.3.0/i686-redhat-linux-gnu/libs/taskmanager/taskmanager.moc:169
#25 0x064fc2de in TaskManager::TaskManager::gotNewStartup (this=0x9d66e48, id=..., data=...) at /usr/src/debug/kdebase-workspace-4.3.0/libs/taskmanager/taskmanager.cpp:391
#26 0x064fed34 in TaskManager::TaskManager::qt_metacall (this=0x9d66e48, _c=InvokeMetaMethod, _id=13, _a=0xbf9f2c24)
    at /usr/src/debug/kdebase-workspace-4.3.0/i686-redhat-linux-gnu/libs/taskmanager/taskmanager.moc:116
#27 0x0559451c in QMetaObject::activate (sender=0x9d79378, from_signal_index=<value optimized out>, to_signal_index=4, argv=0xbf9f2340) at kernel/qobject.cpp:3112
#28 0x05595153 in QMetaObject::activate (sender=0x9d79378, m=0x11f4510, local_signal_index=0, argv=0xbf9f2c24) at kernel/qobject.cpp:3186
#29 0x00ffe9da in KStartupInfo::gotNewStartup (this=0x9d79378, _t1=..., _t2=...) at /usr/src/debug/kdelibs-4.3.0/i686-redhat-linux-gnu/kdeui/kstartupinfo.moc:100
#30 0x01004786 in KStartupInfo::Private::new_startup_info_internal (this=0x9d7ad68, id_P=..., data_P=..., update_P=false) at /usr/src/debug/kdelibs-4.3.0/kdeui/kernel/kstartupinfo.cpp:361
#31 0x010049c9 in KStartupInfo::Private::got_startup_info (this=0x9d7ad68, msg_P=..., update_P=<value optimized out>) at /usr/src/debug/kdelibs-4.3.0/kdeui/kernel/kstartupinfo.cpp:299
#32 0x01009782 in KStartupInfo::Private::got_message (this=0x9d7ad68, msg_P=...) at /usr/src/debug/kdelibs-4.3.0/kdeui/kernel/kstartupinfo.cpp:228
#33 0x01009978 in KStartupInfo::qt_metacall (this=0x9d79378, _c=InvokeMetaMethod, _id=9, _a=0xbf9f2ee8) at /usr/src/debug/kdelibs-4.3.0/i686-redhat-linux-gnu/kdeui/kstartupinfo.moc:86
#34 0x0559451c in QMetaObject::activate (sender=0x9d7ad7c, from_signal_index=<value optimized out>, to_signal_index=27, argv=0xbf9f2340) at kernel/qobject.cpp:3112
#35 0x05595153 in QMetaObject::activate (sender=0x9d7ad7c, m=0x11f6d44, local_signal_index=0, argv=0xbf9f2ee8) at kernel/qobject.cpp:3186
#36 0x0107ee64 in KXMessages::gotMessage (this=0x9d7ad7c, _t1=...) at /usr/src/debug/kdelibs-4.3.0/i686-redhat-linux-gnu/kdeui/kxmessages.moc:78
#37 0x01080438 in KXMessages::x11Event (this=0x9d7ad7c, ev_P=0xbf9f45cc) at /usr/src/debug/kdelibs-4.3.0/kdeui/util/kxmessages.cpp:217
#38 0x00fdee86 in publicx11Event (e=<value optimized out>, this=<value optimized out>) at /usr/src/debug/kdelibs-4.3.0/kdeui/kernel/kapplication.cpp:900
#39 KApplication::x11EventFilter (e=<value optimized out>, this=<value optimized out>) at /usr/src/debug/kdelibs-4.3.0/kdeui/kernel/kapplication.cpp:950
#40 0x00a8e45b in PlasmaApp::x11EventFilter (this=0x987db70, event=0xbf9f45cc) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/shells/desktop/plasmaapp.cpp:490
#41 0x08d10d71 in qt_x11EventFilter (ev=0xbf9f45cc) at kernel/qapplication_x11.cpp:375
#42 0x08d22201 in QApplication::x11ProcessEvent (this=0x987db70, event=0xbf9f45cc) at kernel/qapplication_x11.cpp:3266
#43 0x08d4edc2 in x11EventSourceDispatch (s=0x9891168, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#44 0x052f50a8 in g_main_dispatch (context=<value optimized out>) at gmain.c:1960
#45 IA__g_main_context_dispatch (context=<value optimized out>) at gmain.c:2513
#46 0x052f89d8 in g_main_context_iterate (context=0x9890690, block=<value optimized out>, dispatch=1, self=0x9885888) at gmain.c:2591
#47 0x052f8b04 in IA__g_main_context_iteration (context=0x9890690, may_block=1) at gmain.c:2654
#48 0x055a945d in QEventDispatcherGlib::processEvents (this=0x98689c0, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#49 0x08d4e486 in QGuiEventDispatcherGlib::processEvents (this=0x98689c0, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#50 0x0557cbca in QEventLoop::processEvents (this=0xbf9f48c4, flags=...) at kernel/qeventloop.cpp:149
#51 0x0557d02a in QEventLoop::exec (this=0xbf9f48c4, flags=...) at kernel/qeventloop.cpp:201
#52 0x0557f517 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#53 0x08caea18 in QApplication::exec () at kernel/qapplication.cpp:3525
#54 0x00a784da in kdemain (argc=1, argv=0xbf9f4aa4) at /usr/src/debug/kdebase-workspace-4.3.0/plasma/shells/desktop/main.cpp:50
#55 0x080486fc in main (argc=1, argv=0xbf9f4aa4) at /usr/src/debug/kdebase-workspace-4.3.0/i686-redhat-linux-gnu/plasma/shells/desktop/plasma-desktop_dummy.cpp:3