Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          gcc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2) 
OS:                Linux

I opened the "configure shortcuts" dialog to see why the backspace is not working on my copy. I reassigned "backspace" to "backspace" command, then closed this dialog, triggering this crash :

Application: Kate (kate), signal SIGSEGV
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1243097408 (LWP 7174)]
[KCrash handler]
#6  0xb65c3185 in QString (this=0xbfa7ccc0, other=@0x48)
    at ../../include/QtCore/../../src/corelib/tools/qstring.h:676
#7  0xb65be817 in QAction::text (this=0x9105a08) at kernel/qaction.cpp:751
#8  0xb74420e6 in KShortcutsEditorItem::data (this=0x8e1e2d0, column=0, 
    role=0)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/dialogs/kshortcutseditoritem.cpp:64
#9  0xb7441987 in KShortcutsEditorItem::undo (this=0x8e1e2d0)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/dialogs/kshortcutseditoritem.cpp:283
#10 0xb74429b1 in ~KShortcutsEditorItem (this=0x8e1e2d0)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/dialogs/kshortcutseditoritem.cpp:48
#11 0xb6b3ba26 in ~QTreeWidgetItem (this=0x8dfbb10)
    at itemviews/qtreewidget.cpp:1500
#12 0xb6b40874 in QTreeModel::clear (this=0x9142020)
    at itemviews/qtreewidget.cpp:168
#13 0xb6b40e8b in ~QTreeModel (this=0x9142020)
    at itemviews/qtreewidget.cpp:150
#14 0xb6eb4cda in QObjectPrivate::deleteChildren (this=0x913fc50)
    at kernel/qobject.cpp:1863
#15 0xb661efc1 in ~QWidget (this=0x8e2b498) at kernel/qwidget.cpp:1298
#16 0xb699232b in ~QFrame (this=0x8e2b498) at widgets/qframe.cpp:244
#17 0xb6a29e26 in ~QAbstractScrollArea (this=0x8e2b498)
    at widgets/qabstractscrollarea.cpp:481
#18 0xb6acf455 in ~QAbstractItemView (this=0x8e2b498)
    at itemviews/qabstractitemview.cpp:494
#19 0xb6b0c1b9 in ~QTreeView (this=0x8e2b498) at itemviews/qtreeview.cpp:210
#20 0xb6b3a5f5 in ~QTreeWidget (this=0x8e2b498)
    at itemviews/qtreewidget.cpp:2493
#21 0xb6eb4cda in QObjectPrivate::deleteChildren (this=0x8df9488)
    at kernel/qobject.cpp:1863
#22 0xb661efc1 in ~QWidget (this=0x8e15818) at kernel/qwidget.cpp:1298
#23 0xb74455c7 in ~KShortcutsEditor (this=0x8e15818)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/dialogs/kshortcutseditor.cpp:65
#24 0xb6eb4cda in QObjectPrivate::deleteChildren (this=0x8d70580)
    at kernel/qobject.cpp:1863
#25 0xb661efc1 in ~QWidget (this=0x8d70508) at kernel/qwidget.cpp:1298
#26 0xb644ec05 in ~ConfigPage (this=0x8d70508)
    at /home/valentin/kde/src/4/KDE/kdelibs/interfaces/ktexteditor/ktexteditor.cpp:234
#27 0xb462a4ab in ~KateConfigPage (this=0x8d70508)
    at /home/valentin/kde/src/4/KDE/kdelibs/kate/dialogs/katedialogs.cpp:125
#28 0xb462a8fb in ~KateEditKeyConfiguration (this=0x8d70508)
    at /home/valentin/kde/src/4/KDE/kdelibs/kate/dialogs/katedialogs.cpp:555
#29 0xb6eb4cda in QObjectPrivate::deleteChildren (this=0x90ee9b0)
    at kernel/qobject.cpp:1863
#30 0xb661efc1 in ~QWidget (this=0x8d6fb28) at kernel/qwidget.cpp:1298
#31 0xb699232b in ~QFrame (this=0x8d6fb28) at widgets/qframe.cpp:244
#32 0xb7555add in ~KHBox (this=0x8d6fb28)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/widgets/khbox.cpp:51
#33 0xb759f165 in ~KVBox (this=0x8d6fb28)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/widgets/kvbox.cpp:29
#34 0xb6eb4cda in QObjectPrivate::deleteChildren (this=0x91eca50)
    at kernel/qobject.cpp:1863
#35 0xb661efc1 in ~QWidget (this=0x91f9128) at kernel/qwidget.cpp:1298
#36 0xb699232b in ~QFrame (this=0x91f9128) at widgets/qframe.cpp:244
#37 0xb6a0395b in ~QStackedWidget (this=0x91f9128)
    at widgets/qstackedwidget.cpp:154
#38 0xb74da8b9 in ~KPageStackedWidget (this=0x91f9128)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/paged/kpageview_p.h:38
#39 0xb6eb4cda in QObjectPrivate::deleteChildren (this=0x91ca278)
    at kernel/qobject.cpp:1863
#40 0xb661efc1 in ~QWidget (this=0x863c918) at kernel/qwidget.cpp:1298
#41 0xb74d9211 in ~KPageView (this=0x863c918)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/paged/kpageview.cpp:315
#42 0xb74de661 in ~KPageWidget (this=0x863c918)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/paged/kpagewidget.cpp:78
#43 0xb6eb4cda in QObjectPrivate::deleteChildren (this=0x8d9b170)
    at kernel/qobject.cpp:1863
#44 0xb661efc1 in ~QWidget (this=0x916d300) at kernel/qwidget.cpp:1298
#45 0xb6a75578 in ~QDialog (this=0x916d300) at dialogs/qdialog.cpp:300
#46 0xb741a865 in ~KDialog (this=0x916d300)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/dialogs/kdialog.cpp:181
#47 0xb74d7b0b in ~KPageDialog (this=0x916d300)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/paged/kpagedialog.cpp:66
#48 0xb7d2b00d in ~KateConfigDialog (this=0x916d300)
    at /home/valentin/kde/src/4/KDE/kdesdk/kate/app/kateconfigdialog.cpp:305
#49 0xb7d3d400 in KateMainWindow::slotConfigure (this=0x8154cf8)
    at /home/valentin/kde/src/4/KDE/kdesdk/kate/app/katemainwindow.cpp:685
#50 0xb7d42534 in KateMainWindow::qt_metacall (this=0x8154cf8, 
    _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfa7d4dc)
    at /home/valentin/kde/build/4/KDE/kdesdk/kate/app/katemainwindow.moc:112
#51 0xb6eb9f49 in QMetaObject::activate (sender=0x8381300, 
    from_signal_index=5, to_signal_index=6, argv=0xbfa7d4dc)
    at kernel/qobject.cpp:3001
#52 0xb6eba152 in QMetaObject::activate (sender=0x8381300, m=0xb6ca4e58, 
    from_local_signal_index=1, to_local_signal_index=2, argv=0xbfa7d4dc)
    at kernel/qobject.cpp:3094
#53 0xb65be1a2 in QAction::triggered (this=0x8381300, _t1=false)
    at .moc/debug-shared/moc_qaction.cpp:216
#54 0xb65c00ac in QAction::activate (this=0x8381300, event=QAction::Trigger)
    at kernel/qaction.cpp:1129
#55 0xb69df8f0 in QMenuPrivate::activateAction (this=0x839e2a0, 
    action=0x8381300, action_e=QAction::Trigger, self=true)
    at widgets/qmenu.cpp:1005
#56 0xb69e229d in QMenu::mouseReleaseEvent (this=0x83a8ca0, e=0xbfa7dd48)
    at widgets/qmenu.cpp:2156
#57 0xb756eb6e in KMenu::mouseReleaseEvent (this=0x83a8ca0, e=0xbfa7dd48)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/widgets/kmenu.cpp:408
#58 0xb6623903 in QWidget::event (this=0x83a8ca0, event=0xbfa7dd48)
    at kernel/qwidget.cpp:6850
#59 0xb69dd534 in QMenu::event (this=0x83a8ca0, e=0xbfa7dd48)
    at widgets/qmenu.cpp:2252
#60 0xb65c5eb3 in QApplicationPrivate::notify_helper (this=0x805d0b0, 
    receiver=0x83a8ca0, e=0xbfa7dd48) at kernel/qapplication.cpp:3735
#61 0xb65c69ba in QApplication::notify (this=0xbfa7e5f0, receiver=0x83a8ca0, 
    e=0xbfa7dd48) at kernel/qapplication.cpp:3464
#62 0xb74a82cd in KApplication::notify (this=0xbfa7e5f0, receiver=0x83a8ca0, 
    event=0xbfa7dd48)
    at /home/valentin/kde/src/4/KDE/kdelibs/kdeui/kernel/kapplication.cpp:311
#63 0xb6ea619a in QCoreApplication::notifyInternal (this=0xbfa7e5f0, 
    receiver=0x83a8ca0, event=0xbfa7dd48) at kernel/qcoreapplication.cpp:582
#64 0xb65d1e1b in QCoreApplication::sendSpontaneousEvent (receiver=0x83a8ca0, 
    event=0xbfa7dd48)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#65 0xb65ccd28 in QApplicationPrivate::sendMouseEvent (receiver=0x83a8ca0, 
    event=0xbfa7dd48, alienWidget=0x0, nativeWidget=0x83a8ca0, 
    buttonDown=0xb6cc2be0, lastMouseReceiver=@0xb6cc2be4)
    at kernel/qapplication.cpp:2729
#66 0xb663f9a1 in QETWidget::translateMouseEvent (this=0x83a8ca0, 
    event=0xbfa7e32c) at kernel/qapplication_x11.cpp:4030
#67 0xb663d339 in QApplication::x11ProcessEvent (this=0xbfa7e5f0, 
    event=0xbfa7e32c) at kernel/qapplication_x11.cpp:3096
#68 0xb666cd5d in x11EventSourceDispatch (s=0x80603e8, callback=0, 
    user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:148
#69 0xb602811c in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#70 0xb602b55f in ?? () from /usr/lib/libglib-2.0.so.0
#71 0x0805f840 in ?? ()
#72 0x00000000 in ?? ()
#0  0xffffe410 in __kernel_vsyscall ()