[Qt-interest] QImage fails to save without any error message

[Matthias Pospiech]

I have a programm which saves continously images. This worked in the 
past without any problem.
Today I realized that it fails depending on the path.

So an image with this name will never be saved:
"W:/Projekte/Hibiscus/LaborDatenAuswertungen/Chirped-Gratings/Filme/2009-10-29/CG-Period20-Depth5/CG-Period20-Depth5-01-0-movie-399.png"

whereas this one works:
"E:\Daten\Dev\SVN\hibiscus\Cpp\ShapedMaterialProcessing\test\testMovie-0-movie-0.png"

The QImage returns directly and gives no hint that saving failed.
It is called as (only the last line matters)

        QImage saveimage = QImage(Monitor.width(),Monitor.height(), 
QImage::Format_RGB32);
        saveimage.fill(QColor(0,0,0).rgb());

        QPainter painter( &saveimage );
        int offsetx = (Monitor.width() - image->width())/2;
        painter.drawImage(offsetx, 0, *image );

        saveimage.save(imagesavename,"PNG");


Any idea what is going on? QT is 4.5.2

Matthias