I don't know where to find the debugger traceback in this IDE, but the compiler did spit out this message (toward the bottom) that might be helpful:
Running build steps for project listtest2...
Configuration unchanged, skipping QMake step.
Starting: C:/Qt/2009.03/mingw/bin/mingw32-make.exe -w
mingw32-make: Entering directory `C:/Documents and Settings/Administrator/My Documents/listtest2'
C:/Qt/2009.03/mingw/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Documents and Settings/Administrator/My Documents/listtest2'
c:\Qt\2009.03\qt\bin\uic.exe mainwindow.ui -o ui_mainwindow.h
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2009.03\qt\include\QtCore" -I"..\..\..\..\Qt\2009.03\qt\include\QtGui" -I"..\..\..\..\Qt\2009.03\qt\include" -I"..\..\..\..\Qt\2009.03\qt\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\2009.03\qt\mkspecs\win32-g++" -o debug\main.o main.cpp
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2009.03\qt\include\QtCore" -I"..\..\..\..\Qt\2009.03\qt\include\QtGui" -I"..\..\..\..\Qt\2009.03\qt\include" -I"..\..\..\..\Qt\2009.03\qt\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\2009.03\qt\mkspecs\win32-g++" -o debug\mainwindow.o mainwindow.cpp
C:/Qt/2009.03/qt/bin\moc.exe -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2009.03\qt\include\QtCore" -I"..\..\..\..\Qt\2009.03\qt\include\QtGui" -I"..\..\..\..\Qt\2009.03\qt\include" -I"..\..\..\..\Qt\2009.03\qt\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\2009.03\qt\mkspecs\win32-g++" -D__GNUC__ -DWIN32 mainwindow.h -o debug\moc_mainwindow.cpp
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2009.03\qt\include\QtCore" -I"..\..\..\..\Qt\2009.03\qt\include\QtGui" -I"..\..\..\..\Qt\2009.03\qt\include" -I"..\..\..\..\Qt\2009.03\qt\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\2009.03\qt\mkspecs\win32-g++" -o debug\moc_mainwindow.o debug\moc_mainwindow.cpp
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -mthreads -Wl -Wl,-subsystem,windows -o debug\listtest2.exe debug/main.o debug/mainwindow.o debug/moc_mainwindow.o -L"c:\Qt\2009.03\qt\lib" -lmingw32 -lqtmaind -lQtGuid4 -lQtCored4
debug/mainwindow.o: In function `ZThn8_N10MainWindowD1Ev':
C:/Documents and Settings/Administrator/My Documents/listtest2/mainwindow.cpp:(.text$_ZN12ItemDelegateC1EP7QObject[ItemDelegate::ItemDelegate(QObject*)]+0x1f): undefined reference to `vtable for ItemDelegate'
collect2: ld returned 1 exit status
mingw32-make[1]: Leaving directory `C:/Documents and Settings/Administrator/My Documents/listtest2'
mingw32-make: Leaving directory `C:/Documents and Settings/Administrator/My Documents/listtest2'
mingw32-make[1]: *** [debug\listtest2.exe] Error 1
mingw32-make: *** [debug] Error 2
Exited with code 2.
Error while building project listtest2
When executing build step 'Make'
Running build steps for project listtest2...
Configuration unchanged, skipping QMake step.
Starting: C:/Qt/2009.03/mingw/bin/mingw32-make.exe -w
mingw32-make: Entering directory `C:/Documents and Settings/Administrator/My Documents/listtest2'
C:/Qt/2009.03/mingw/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Documents and Settings/Administrator/My Documents/listtest2'
c:\Qt\2009.03\qt\bin\uic.exe mainwindow.ui -o ui_mainwindow.h
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2009.03\qt\include\QtCore" -I"..\..\..\..\Qt\2009.03\qt\include\QtGui" -I"..\..\..\..\Qt\2009.03\qt\include" -I"..\..\..\..\Qt\2009.03\qt\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\2009.03\qt\mkspecs\win32-g++" -o debug\main.o main.cpp
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2009.03\qt\include\QtCore" -I"..\..\..\..\Qt\2009.03\qt\include\QtGui" -I"..\..\..\..\Qt\2009.03\qt\include" -I"..\..\..\..\Qt\2009.03\qt\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\2009.03\qt\mkspecs\win32-g++" -o debug\mainwindow.o mainwindow.cpp
C:/Qt/2009.03/qt/bin\moc.exe -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2009.03\qt\include\QtCore" -I"..\..\..\..\Qt\2009.03\qt\include\QtGui" -I"..\..\..\..\Qt\2009.03\qt\include" -I"..\..\..\..\Qt\2009.03\qt\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\2009.03\qt\mkspecs\win32-g++" -D__GNUC__ -DWIN32 mainwindow.h -o debug\moc_mainwindow.cpp
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\2009.03\qt\include\QtCore" -I"..\..\..\..\Qt\2009.03\qt\include\QtGui" -I"..\..\..\..\Qt\2009.03\qt\include" -I"..\..\..\..\Qt\2009.03\qt\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\2009.03\qt\mkspecs\win32-g++" -o debug\moc_mainwindow.o debug\moc_mainwindow.cpp
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -mthreads -Wl -Wl,-subsystem,windows -o debug\listtest2.exe debug/main.o debug/mainwindow.o debug/moc_mainwindow.o -L"c:\Qt\2009.03\qt\lib" -lmingw32 -lqtmaind -lQtGuid4 -lQtCored4
debug/mainwindow.o: In function `ZThn8_N10MainWindowD1Ev':
C:/Documents and Settings/Administrator/My Documents/listtest2/mainwindow.cpp:(.text$_ZN12ItemDelegateC1EP7QObject[ItemDelegate::ItemDelegate(QObject*)]+0x1f): undefined reference to `vtable for ItemDelegate'
collect2: ld returned 1 exit status
mingw32-make[1]: Leaving directory `C:/Documents and Settings/Administrator/My Documents/listtest2'
mingw32-make: Leaving directory `C:/Documents and Settings/Administrator/My Documents/listtest2'
mingw32-make[1]: *** [debug\listtest2.exe] Error 1
mingw32-make: *** [debug] Error 2
Exited with code 2.
Error while building project listtest2
When executing build step 'Make'
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Thanks for all your help thus far.
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