Lightbox: Un-zooming to remove scrollbars and recenter image?

When an image is displayed in Lightbox (see attachment 1), and I click the zoom option, the image correctly enlarges, scroll bars appear (see attachment 2), and I can scroll down the image to see more (see attachment 3).

When I click the un-zoom button to go back to the original Lighbox image, the scrollbars remain, and the page remains partly hidden (see attachment 4). It would be nice if the page would return back to display the Lighbox image (see attachment 1).