QPainter error saving an image from a QGraphicsScene

[cydside]

Ok, but I'm warning you, it's quite strange. So I've commented the problem core lines:

QPixmap pixmap(endX, endY);
   QPainter painter(&pixmap);
//   painter.setRenderHint(QPainter::Antialiasing);
//   scene->render(&painter);
//   painter.end();
//   pixmap.save(QDir::currentPath() + "/statistiche.png");

QPixmap pixmap(endX, endY);
   QPainter painter(&pixmap);
//   painter.setRenderHint(QPainter::Antialiasing);
//   scene->render(&painter);
//   painter.end();
//   pixmap.save(QDir::currentPath() + "/statistiche.png");

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leaving only the QPainter declaration. That to find which instruction was the problem. And Taaa Daaa line by line I arrived at the end without having the error anymore!!!
I don't know if it depends by the compiler (just a flicker) or my PC but now is working, that's my honest work, believe or not.