Qgraphicsscene selecteditems boundingrect returns -nan?

[devdon]

[CODE] QList<QGraphicsItem*> iList;

iList = scene->selectedItems();
QRectF bRect = scene->selectionArea().boundingRect();

[/CODE]

Hello: The above code returns
h (qreal)
w (qreal)
x -nan(0xffffe1518ee2)
y (qreal)

Sometimes is the y coordinate that returns -nan and x is OK.

Since I am new to QT perhaps this is to be expected, but the selectedItems() function seems a bit sketchy, skipping items that might be obscured. I have an important routine that relies on it and it doesn't seem to return all the items consistently. Has anyone an explanation or similar experiences?