Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
The Microblogging widget crashes in two ways:
- unchecking the "Show Friends" box; (not that the widget is showing friends); this one has been reported;
- reinstalling the widget, not entering user names but just unchecking Show Friends, then clicking OK; that works. However, when subsequently entering a user name and password, Plasma will crash.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  KConfigGroup::writeEntry (this=0xbff516e4, key=0xa25f94e6 "password", value=@0xbff5165c, flags={i = -1074457000}) at /usr/include/qt4/QtCore/qshareddata.h:187
#7  0xb7c29a7d in KConfigGroup::writeEntry (this=0xbff516e4, key=0xa25f94e6 "password", value=@0xb766988, flags={i = -1074456828}) at /build/buildd/kde4libs-4.3.0/kdecore/config/kconfiggroup.cpp:904
#8  0xa25f00fc in ?? () from /usr/lib/kde4/plasma_applet_microblog.so
#9  0xa25f5822 in ?? () from /usr/lib/kde4/plasma_applet_microblog.so
#10 0xa25f6953 in ?? () from /usr/lib/kde4/plasma_applet_microblog.so
#11 0xb7f421b8 in QMetaObject::activate (sender=0xb62f0a8, from_signal_index=45, to_signal_index=45, argv=0x0) at kernel/qobject.cpp:3113
#12 0xb7f42e42 in QMetaObject::activate (sender=0xb62f0a8, m=0xb76a6144, local_signal_index=9, argv=0x0) at kernel/qobject.cpp:3187
#13 0xb74643d7 in KDialog::okClicked (this=0xb62f0a8) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kdeui/kdialog.moc:252
#14 0xb7466c18 in KDialog::slotButtonClicked (this=0xb62f0a8, button=4) at /build/buildd/kde4libs-4.3.0/kdeui/dialogs/kdialog.cpp:854
#15 0xb7468e2c in KDialog::qt_metacall (this=0xb62f0a8, _c=QMetaObject::InvokeMetaMethod, _id=33, _a=0xbff51a7c) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kdeui/kdialog.moc:184
#16 0xb752f72a in KPageDialog::qt_metacall (this=0xb62f0a8, _c=QMetaObject::InvokeMetaMethod, _id=69, _a=0xbff51a7c) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kdeui/kpagedialog.moc:64
#17 0xb745391a in KConfigDialog::qt_metacall (this=0xb62f0a8, _c=QMetaObject::InvokeMetaMethod, _id=69, _a=0xbff51a7c) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kdeui/kconfigdialog.moc:78
#18 0xb7f421b8 in QMetaObject::activate (sender=0xb31def8, from_signal_index=4, to_signal_index=4, argv=0xbff51a7c) at kernel/qobject.cpp:3113
#19 0xb7f42e42 in QMetaObject::activate (sender=0xb31def8, m=0xb801e878, local_signal_index=0, argv=0xbff51a7c) at kernel/qobject.cpp:3187
#20 0xb7f45ab3 in QSignalMapper::mapped (this=0xb31def8, _t1=4) at .moc/release-shared/moc_qsignalmapper.cpp:95
#21 0xb7f4633d in QSignalMapper::map (this=0xb31def8, sender=0xb74f460) at kernel/qsignalmapper.cpp:266
#22 0xb7f4652e in QSignalMapper::map (this=0xb31def8) at kernel/qsignalmapper.cpp:257
#23 0xb7f46dfb in QSignalMapper::qt_metacall (this=0xb31def8, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbff51bfc) at .moc/release-shared/moc_qsignalmapper.cpp:81
#24 0xb7f421b8 in QMetaObject::activate (sender=0xb74f460, from_signal_index=29, to_signal_index=30, argv=0xbff51bfc) at kernel/qobject.cpp:3113
#25 0xb7f425f0 in QMetaObject::activate (sender=0xb74f460, m=0xb72680a4, from_local_signal_index=2, to_local_signal_index=3, argv=0xbff51bfc) at kernel/qobject.cpp:3207
#26 0xb707ef91 in QAbstractButton::clicked (this=0xb74f460, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:200
#27 0xb6da63e9 in QAbstractButtonPrivate::emitClicked (this=0xb644728) at widgets/qabstractbutton.cpp:543
#28 0xb6da8044 in QAbstractButtonPrivate::click (this=0xb644728) at widgets/qabstractbutton.cpp:536
#29 0xb6da82d6 in QAbstractButton::mouseReleaseEvent (this=0xb74f460, e=0xbff521d8) at widgets/qabstractbutton.cpp:1115
#30 0xb6a44973 in QWidget::event (this=0xb74f460, event=0xbff521d8) at kernel/qwidget.cpp:7549
#31 0xb6da628e in QAbstractButton::event (this=0xb74f460, e=0xbff521d8) at widgets/qabstractbutton.cpp:1077
#32 0xb6e51050 in QPushButton::event (this=0xb74f460, e=0xbff521d8) at widgets/qpushbutton.cpp:662
#33 0xb69edd3c in QApplicationPrivate::notify_helper (this=0x9ecee00, receiver=0xb74f460, e=0xbff521d8) at kernel/qapplication.cpp:4056
#34 0xb69f69b1 in QApplication::notify (this=0x9ec9220, receiver=0xb74f460, e=0xbff521d8) at kernel/qapplication.cpp:3758
#35 0xb74fe5cd in KApplication::notify (this=0x9ec9220, receiver=0xb74f460, event=0xbff521d8) at /build/buildd/kde4libs-4.3.0/kdeui/kernel/kapplication.cpp:302
#36 0xb7f2cbcb in QCoreApplication::notifyInternal (this=0x9ec9220, receiver=0xb74f460, event=0xbff521d8) at kernel/qcoreapplication.cpp:610
#37 0xb69f5a1e in QApplicationPrivate::sendMouseEvent (receiver=0xb74f460, event=0xbff521d8, alienWidget=0xb74f460, nativeWidget=0xb62f0a8, buttonDown=0xb726faa0, lastMouseReceiver=@0xb726faa4)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#38 0xb6a65cce in QETWidget::translateMouseEvent (this=0xb62f0a8, event=0xbff5386c) at kernel/qapplication_x11.cpp:4409
#39 0xb6a65085 in QApplication::x11ProcessEvent (this=0x9ec9220, event=0xbff5386c) at kernel/qapplication_x11.cpp:3428
#40 0xb6a9037a in x11EventSourceDispatch (s=0x9ed1ca8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#41 0xb65a0b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#42 0xb65a40eb in ?? () from /usr/lib/libglib-2.0.so.0
#43 0xb65a4268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#44 0xb7f582f8 in QEventDispatcherGlib::processEvents (this=0x9eceb18, flags={i = -1074447832}) at kernel/qeventdispatcher_glib.cpp:327
#45 0xb6a8fa75 in QGuiEventDispatcherGlib::processEvents (this=0x9eceb18, flags={i = -1074447784}) at kernel/qguieventdispatcher_glib.cpp:202
#46 0xb7f2b1fa in QEventLoop::processEvents (this=0xbff53ad0, flags={i = -1074447720}) at kernel/qeventloop.cpp:149
#47 0xb7f2b642 in QEventLoop::exec (this=0xbff53ad0, flags={i = -1074447656}) at kernel/qeventloop.cpp:201
#48 0xb7f2dae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#49 0xb69edbb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#50 0xb4bb4120 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#51 0x0804e27d in launch (argc=1, _name=0x9e6257c "/usr/bin/plasma-desktop", args=0x9e62594 "", cwd=0x0, envc=0, envs=0x9e62598 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x805136d "0") at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:676
#52 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1168
#53 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1361
#54 0x0804fbca in main (argc=2, argv=0xbff542c4, envp=0xbff542d0) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1788

Reported using DrKonqi