Version:           1.2.0_devel (using KDE KDE 3.4.0)
OS:                Linux

Steps to Reproduce:

Start kst.  
Go to Data -> New Matrix
Load a matrix from an image file (like a png).  Any settings will do.
Go to Data -> New Image
Create the new image to plot the matrix (again, just select ok)
Right click on the image (in the plot), got to Edit -> Matrix name
Kst will crash.  

Backtrace:
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1208264224 (LWP 3933)]
[New Thread -1211790416 (LWP 3935)]
(no debugging symbols found)
(no debugging symbols found)
[KCrash handler]
#4  0x05bef92c in KstMatrixDialogI::_fillFieldsForEdit ()
   from /usr/lib/libkstapp.so.1
#5  0x05befe22 in KstMatrixDialogI::show_Edit () from /usr/lib/libkstapp.so.1
#6  0x05b4013e in Kst2DPlot::editMatrix () from /usr/lib/libkstapp.so.1
#7  0x05b4a7fe in Kst2DPlot::qt_invoke () from /usr/lib/libkstapp.so.1
#8  0x04bc1df4 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#9  0x04bc2428 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#10 0x04f3a175 in QSignal::intSignal () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#11 0x04bdf65d in QSignal::activate () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#12 0x04cd65c2 in QPopupMenu::mouseReleaseEvent ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#13 0x054f41cb in KPopupMenu::mouseReleaseEvent () from /usr/lib/libkdeui.so.4
#14 0x04c00167 in QWidget::event () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#15 0x04b5d0cd in QApplication::internalNotify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#16 0x04b5e02f in QApplication::notify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#17 0x05222851 in KApplication::notify () from /usr/lib/libkdecore.so.4
#18 0x04af4b4d in QETWidget::translateMouseEvent ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#19 0x04af2f01 in QApplication::x11ProcessEvent ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#20 0x04b07008 in QEventLoop::processEvents ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#21 0x04b75772 in QEventLoop::enterLoop ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#22 0x04b5cabf in QApplication::enter_loop ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#23 0x04cdcfc7 in QPopupMenu::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#24 0x04cdd0b0 in QPopupMenu::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#25 0x05b63f1f in KstViewWidget::contextMenuEvent ()
   from /usr/lib/libkstapp.so.1
#26 0x04c00311 in QWidget::event () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#27 0x04b5d0cd in QApplication::internalNotify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#28 0x04b5dbe5 in QApplication::notify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#29 0x05222851 in KApplication::notify () from /usr/lib/libkdecore.so.4
#30 0x04af4d71 in QETWidget::translateMouseEvent ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#31 0x04af2f01 in QApplication::x11ProcessEvent ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#32 0x04b07008 in QEventLoop::processEvents ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#33 0x04b75772 in QEventLoop::enterLoop ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#34 0x04b75696 in QEventLoop::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#35 0x04b5ca99 in QApplication::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#36 0x080523de in main ()
#37 0x00574de6 in __libc_start_main () from /lib/libc.so.6
#38 0x0804cd71 in _start ()