QPrinter prints blank page on windows xp

[cszawisza]

Hi!
My program needs to print an plot (QWT plot), so I write fallowing code

void re82print::on_btnPrint_clicked()
{
    QPrinter *printer = new QPrinter();
    printer->setOrientation( QPrinter::Landscape );
    printer->setPageSize( QPrinter::A4 );
    printer->setPageMargins (15,15,15,15,QPrinter::Millimeter);
    printer->setFullPage(false);
 
    QPrintDialog dialog( printer , this);
    if ( dialog.exec() )
    {
        QwtPlotRenderer rend;
        QPainter painter(printer);
        rend.setDiscardFlag(QwtPlotRenderer::DiscardNone, true);
        rend.setDiscardFlag(QwtPlotRenderer::DiscardBackground, true);
        rend.render(mPlot, &painter, printer->pageRect());
        painter.end();
    }
 
    delete printer;
}

void re82print::on_btnPrint_clicked()
{
    QPrinter *printer = new QPrinter();
    printer->setOrientation( QPrinter::Landscape );
    printer->setPageSize( QPrinter::A4 );
    printer->setPageMargins (15,15,15,15,QPrinter::Millimeter);
    printer->setFullPage(false);

    QPrintDialog dialog( printer , this);
    if ( dialog.exec() )
    {
        QwtPlotRenderer rend;
        QPainter painter(printer);
        rend.setDiscardFlag(QwtPlotRenderer::DiscardNone, true);
        rend.setDiscardFlag(QwtPlotRenderer::DiscardBackground, true);
        rend.render(mPlot, &painter, printer->pageRect());
        painter.end();
    }

    delete printer;
}

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on my linux os everything works well but on windows XP it prints a blank page, any ideas why?
// QT 5.3 and pdf printers on both OS