Version:           4.1 (using KDE 4.1.3)
OS:                Linux
Installed from:    Unspecified Linux

I opened KAddressBook, added a few contacts, then closed via the "x", at which time I got a crash message (SIGSEGV 11). Here's the backtrace: 

Application: KAddressBook (kaddressbook), signal SIGSEGV
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb4f72700 (LWP 8921)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[KCrash handler]
#6  0xb7973d32 in KPopupFrame::exec () from /usr/lib/libkdeui.so.5
#7  0xb79707b7 in KDatePicker::selectYearClicked ()
   from /usr/lib/libkdeui.so.5
#8  0xb79721b3 in KDatePicker::qt_metacall () from /usr/lib/libkdeui.so.5
#9  0xb7dbe81b in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0xb7dbed72 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#11 0xb5fe4f29 in QAbstractButton::toggled () from /usr/lib/libQtGui.so.4
#12 0xb5d777a5 in QAbstractButton::setChecked () from /usr/lib/libQtGui.so.4
#13 0xb5d77960 in QAbstractButton::nextCheckState ()
   from /usr/lib/libQtGui.so.4
#14 0xb5e409c0 in QToolButton::nextCheckState () from /usr/lib/libQtGui.so.4
#15 0xb5d77453 in ?? () from /usr/lib/libQtGui.so.4
#16 0x0a3ac718 in ?? ()
#17 0xb60b2f60 in ?? () from /usr/lib/libQtGui.so.4
#18 0xbff37698 in ?? ()
#19 0xb7dab5a4 in QBasicTimer::stop () from /usr/lib/libQtCore.so.4
#20 0xb5d776f6 in QAbstractButton::mouseReleaseEvent ()
   from /usr/lib/libQtGui.so.4
#21 0xb5e40e4c in QToolButton::mouseReleaseEvent ()
   from /usr/lib/libQtGui.so.4
#22 0xb5ad3d56 in QWidget::event () from /usr/lib/libQtGui.so.4
#23 0xb5d7652e in QAbstractButton::event () from /usr/lib/libQtGui.so.4
#24 0xb5e40974 in QToolButton::event () from /usr/lib/libQtGui.so.4
#25 0xb5a81b1c in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#26 0xb5a88893 in QApplication::notify () from /usr/lib/libQtGui.so.4
#27 0xb78cf19d in KApplication::notify () from /usr/lib/libkdeui.so.5
#28 0xb7dacfc1 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#29 0xb5a89c13 in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib/libQtGui.so.4
#30 0xb5ae6945 in ?? () from /usr/lib/libQtGui.so.4
#31 0x0a3ac718 in ?? ()
#32 0xbff37c9c in ?? ()
#33 0x0a3ac718 in ?? ()
#34 0x0a3aae48 in ?? ()
#35 0xb60b4bd0 in ?? () from /usr/lib/libQtGui.so.4
#36 0xb60b4bd4 in ?? () from /usr/lib/libQtGui.so.4
#37 0xbff37d2c in ?? ()
#38 0x0a4208a8 in ?? ()
#39 0xb56b9140 in ?? () from /lib/libc.so.6
#40 0x00000001 in ?? ()
#41 0xb60b4bb0 in ?? () from /usr/lib/libQtGui.so.4
#42 0x0a426498 in ?? ()
#43 0xb56b9140 in ?? () from /lib/libc.so.6
#44 0xbff37d10 in ?? ()
#45 0xbff37d08 in ?? ()
#46 0xb5c1e286 in ?? () from /usr/lib/libQtGui.so.4
#47 0xbff37cac in ?? ()
#48 0x0a3aae48 in ?? ()
#49 0xbff37c9c in ?? ()
#50 0x0a067180 in ?? ()
#51 0x0a40edb0 in ?? ()
#52 0x00000003 in ?? ()
#53 0x00000001 in ?? ()
#54 0x0a3aae48 in ?? ()
#55 0x0a3aae48 in ?? ()
#56 0x013aae48 in ?? ()
#57 0x0a3ac718 in ?? ()
#58 0x00000003 in ?? ()
#59 0x0a3ac718 in ?? ()
#60 0x00000000 in ?? ()
#0  0xb7f1d424 in __kernel_vsyscall ()