Qwt-based code works fine in command prompt, but not from within QtCreator

[maduar]

Hi all

I´ve built a small app using Qwt with .pro file like this:

QT += opengl \
    sql \
    svg \
    xml
LIBS += c:/qwt-5.2.0/lib/qwt5.dll c:/qwt-5.2.0/lib/qwtd5.dll
INCLUDEPATH += c:/qwt-5.2.0/src
DEFINES += QWT_DLL
CONFIG += debug_and_release
TARGET = qtcreator2
TEMPLATE = app
SOURCES += main.cpp \
    mainwindow.cpp \
    plotterwidgetqwt.cpp
HEADERS += mainwindow.h \
    plotterwidgetqwt.h
FORMS += mainwindow.ui \
    plotterwidgetqwt.ui
RESOURCES += mdi.qrc

QT += opengl \
    sql \
    svg \
    xml
LIBS += c:/qwt-5.2.0/lib/qwt5.dll c:/qwt-5.2.0/lib/qwtd5.dll
INCLUDEPATH += c:/qwt-5.2.0/src
DEFINES += QWT_DLL
CONFIG += debug_and_release
TARGET = qtcreator2
TEMPLATE = app
SOURCES += main.cpp \
    mainwindow.cpp \
    plotterwidgetqwt.cpp
HEADERS += mainwindow.h \
    plotterwidgetqwt.h
FORMS += mainwindow.ui \
    plotterwidgetqwt.ui
RESOURCES += mdi.qrc

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Inside QtCreator, I guess I´ve set all properly (Qt location C:\Qt\2009.04\qt, gdb location C:\Qt\2009.04\mingw\bin\gdb.exe, etc), and the code compiles ok. In fact, from a command prompt with proper path to qwt5.dll and qwtd5.dll, both release and debug executables work fine.
But when I run from within QtCreator (Ctrl+R), the app doesn´t start and I get:

C:\<MyPath>qtcreator2\debug\qtcreator2.exe exited with code -1073741515

What could be wrong???? Tks.