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It is strange. This code is working for me:

int main( int argc, char** argv )
{
IplImage* gray;
uchar* data;
int m_width;
int m_height;

IplImage * pImgEmbed = NULL;

char filename[] = "baboon.jpg";
gray=cvLoadImage(filename,0);
data=(uchar *)gray->imageData;
          m_width=gray->width;
          m_height=gray->height;

pImgEmbed=cvCreateImageHeader(cvSize(m_width, m_height), IPL_DEPTH_8U, 1);

cvSetData( pImgEmbed, data, m_width );
cvNamedWindow("sample");
cvShowImage("sample", pImgEmbed);
cvWaitKey(0);
return 0;
}

What version of OpenCV do you use? What OS?