kontact konstantly krashing

After a long period of flawless operation, kontact started crashing 
regularly.

Despite repeated removes, purges and (re)installs; renaming and deleting 
"rc's" and "ics's";  and, finally in desperation upgrading ubuntu the 
problem continues.

The following is the latest krash output:

(no debugging symbols found)

... 49 repeats snipped ...

(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb5e9b6c0 (LWP 6046)]
[New Thread 0xb356db90 (LWP 6065)]
[New Thread 0xb3d6eb90 (LWP 6064)]
[New Thread 0xb456fb90 (LWP 6063)]
[New Thread 0xb4d70b90 (LWP 6062)]
(no debugging symbols found)

... 83 repeats snipped ...

(no debugging symbols found)
[KCrash handler]
#6  0xb7b7b0d8 in QObject::isWidgetType () from /usr/lib/libqui.so.1
#7  0xb68b334e in QTipManager::eventFilter () from /usr/lib/libqt-mt.so.3
#8  0xb66e8a24 in QApplication::internalNotify () from 
/usr/lib/libqt-mt.so.3
#9  0xb66eade5 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#10 0xb6ea99b2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#11 0xb6679301 in QApplication::sendSpontaneousEvent ()
   from /usr/lib/libqt-mt.so.3
#12 0xb6677f8d in QETWidget::translateMouseEvent ()
   from /usr/lib/libqt-mt.so.3
#13 0xb667612f in QApplication::x11ProcessEvent () from 
/usr/lib/libqt-mt.so.3
#14 0xb668d943 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#15 0xb6703f90 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#16 0xb6703c8e in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#17 0xb66ea7df in QApplication::exec () from /usr/lib/libqt-mt.so.3
#18 0x0805c123 in ?? ()
#19 0xb5eff450 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#20 0x0805b7f1 in ?? ()

Can someone please tell me whether my problem is that there is a bug 
within kontact that I should be reporting or if one (or perhaps more) of 
"my" files is corrupted.  And if the latter how I would go about 
correcting the problem.

I REALLY want to continue using kontact and, will re-key all the data if 
I have to.  But I really would like to know that I won't be facing this 
kontinual krashing yet again.

Thanks very much for your help