0xc0000005 error when using qVector

[przemo]

hello,
I've just started working with QT and wanted to test some core classes, before working with gui. However, even at this point I encountered difficulties. This is the code

#include <QtCore/QVector>
 
int main(int argc, char* argv[])
{
    QVector<uchar> vector;
    vector.push_back(30);
 
    return 0;
}

#include <QtCore/QVector>

int main(int argc, char* argv[])
{
    QVector<uchar> vector;
    vector.push_back(30);
    
    return 0;
}

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Everything compiles fine. On runtime I get the following error:

The application failed to initialize properly (0xc0000005). Click OK to terminate

I noticed that it's a problem of QVector. QList, for example, works fine.
It's the same either both on debug an release.
IDE: Code-Blocks 10.05
compiler: mingw 4.5.0-1
QT 4.7.1 compiled for mingw

I'd be thankful for any help to this frustrating problem.