Version:            (using KDE 4.0.5)
Installed from:    Fedora RPMs
OS:                Linux

I changed the option for colors (calendar, category), after that I opened Help document. While viewing the help Korganizer crashed, bt is bellow. 

I also noticed something strange, instead of showing an icon on the panel tray the icon was displayed on my desktop in a normal window. The bg of the window was transparent, I have it set like that for terminal, maybe this is relevant. I think the window title was K daemon or similar. 
I'm not sure but I think the window issue only occurs after I relogin. I noticed the same issue with the icon in a window with Knotes. I have Knotes and Korganizer listed in sessions under Startup programs. On fedora9 there is no GUI to set Autologin or TimedLogin, I set it up manually in gdm.shemas, this might also be relevant.

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[Thread debugging using libthread_db enabled]
[New Thread 0x7f92cec2b750 (LWP 6886)]
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[KCrash handler]
#5  0x0000000000683215 in raise () from /lib64/libc.so.6
#6  0x0000000000684d83 in abort () from /lib64/libc.so.6
#7  0x00000000006c3928 in __libc_message () from /lib64/libc.so.6
#8  0x00000000006c9228 in malloc_printerr () from /lib64/libc.so.6
#9  0x00000000006cb866 in free () from /lib64/libc.so.6
#10 0x0000003f5239af1a in QWidget::~QWidget ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#11 0x0000003f59d26a6b in KOAgendaView::~KOAgendaView ()
   from /usr/lib64/libkorganizer.so.1
#12 0x0000003f5239af1a in QWidget::~QWidget ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#13 0x0000003f524a5bb2 in QWidgetStack::~QWidgetStack ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#14 0x0000003f5239af1a in QWidget::~QWidget ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#15 0x0000003f526c8631 in QVBox::~QVBox ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#16 0x0000003f5239af1a in QWidget::~QWidget ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#17 0x0000003f5248ad91 in QSplitter::~QSplitter ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#18 0x0000003f5239af1a in QWidget::~QWidget ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#19 0x0000003f59d4df8e in CalendarView::~CalendarView ()
   from /usr/lib64/libkorganizer.so.1
#20 0x0000003f59dc82a3 in ActionManager::~ActionManager ()
   from /usr/lib64/libkorganizer.so.1
#21 0x000000000040a986 in ?? ()
#22 0x0000003f523607b1 in QObject::event ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#23 0x0000003f52398113 in QWidget::event ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#24 0x0000003f522fed2d in QApplication::internalNotify ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#25 0x0000003f522ffc0c in QApplication::notify ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#26 0x0000003f539d6dd2 in KApplication::notify ()
   from /usr/lib64/libkdecore.so.4
#27 0x0000003f52300baa in QApplication::sendPostedEvents ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#28 0x0000003f523176d1 in QEventLoop::enterLoop ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#29 0x0000003f52317522 in QEventLoop::exec ()
   from /usr/lib64/qt-3.3/lib/libqt-mt.so.3
#30 0x000000000040a0bc in QWidget::setUpdatesEnabled ()
#31 0x000000000066f32a in __libc_start_main () from /lib64/libc.so.6
#32 0x0000000000409e69 in QWidget::setUpdatesEnabled ()
#33 0x00007fffd6ef0788 in ?? ()
#34 0x000000000000001c in ?? ()
#35 0x0000000000000001 in ?? ()
#36 0x00007fffd6ef1b0d in ?? ()
#37 0x0000000000000000 in ?? ()