Version:           3.5.1 (using KDE 3.5.1, Kubuntu Package 4:3.5.1-0ubuntu7 dapper)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.15-15-686

I right-clicked on Klipper (not started as process but as kicker *.so) multiple times, while akregator and kmail were unloading (simultaneously). Then kicker crashed. Sadly, this is not really reproducable.

Backtrace follows:

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 915363520 (LWP 3824)]
[KCrash handler]
#6  0x080550c2 in ?? ()
#7  0x371a007b in qt_cleanup () from /usr/lib/libqt-mt.so.3
#8  0x371a8584 in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#9  0x371c1cc7 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#10 0x37236153 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#11 0x37236076 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#12 0x3721c169 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#13 0x36774600 in kdemain () from /usr/lib/libkdeinit_kicker.so
#14 0x37f294f4 in kdeinitmain () from /usr/lib/kde3/kicker.so
#15 0x0804e00f in launch (argc=1, _name=0x81213d4 "kicker", 
    args=0x81213db "", cwd=0x0, envc=0, envs=0x81213df "", reset_env=false, 
    tty=0x0, avoid_loops=false, 
    startup_id_str=0x371a92ba "4\0014\001\204