Zooming problem with QwtSymbol::Ellipse

[fatecasino]

Hi,

I have qwt-6.0.0-rc5. The symbols are plotted perfectly fine,
but when I want to zoom I get a segmentation fault.

QwtSymbol sym;
 
          sym.setStyle(QwtSymbol::Ellipse);
          sym.setPen(QPen(Qt::black));
          QBrush brush(Qt::yellow);
          sym.setBrush(brush);
          sym.setSize(1);
 
          continuumCurve->setSymbol(&sym);

QwtSymbol sym;

          sym.setStyle(QwtSymbol::Ellipse);
          sym.setPen(QPen(Qt::black));
          QBrush brush(Qt::yellow);
          sym.setBrush(brush);
          sym.setSize(1);

          continuumCurve->setSymbol(&sym);

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