QGraphicsView::centerOn(QPoint) giving a strange result

I'm getting some odd behaviour with centerOn that I need to sort out. It's not putting the selected point in the centre of the screen.. it's scrolling past the screen centre even though I have made sure the view is set to Qt::AlignCenter.

eg:

Code:

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myView->setAlignment(Qt::AlignCenter);
	myScene->importImages(selection);
	myScene->setSceneRect(myScene->itemsBoundingRect());
	qDebug() << "loadSelection #1" << myView->sceneRect() << myScene->sceneRect() << myScene->sceneRect().center() << myView->mapFromScene(myScene->sceneRect().center()) << myView->mapFromScene(QPointF(0.0,0.0));
	myView->centerOn(myScene->sceneRect().center());
	qDebug() << "loadSelection #2" << myView->sceneRect() << myScene->sceneRect() << myScene->sceneRect().center() << myView->mapFromScene(myScene->sceneRect().center()) << myView->mapFromScene(QPointF(0.0,0.0));

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gives the result:

Code:

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[Qt Message] loadSelection #1 QRectF(0,0 1358x1028.39) QRectF(0,0 1358x1028.39) QPointF(679, 514.194) QPoint(679,514) QPoint(0,0) 
[Qt Message] loadSelection #2 QRectF(0,0 1358x1028.39) QRectF(0,0 1358x1028.39) QPointF(679, 514.194) QPoint(48,122) QPoint(-631,-392)

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as you can see, the centre is actually placed at (48, 122) instead of where it should be at (180, 320) on a view of (360, 640).

Any ideas?