Sometimes, i make the mistake of creating my section viewports with the wrong direction. This might seem like a problem, but it is not. On the Object Info palette there is a button to reverse the direction of the Section Viewport.
Of course, it is not always a mistake to have the Section Viewport looking the wrong way, it might be a design change makes it more suitable to have the section looking the other way.
This movie shows you how to change the direction of a Section Viewport.