Issues with CSS clipping

I have a page up at URL that uses a little Photoshop-style window with a draggable layer inside. It works in general, except for when one drags the graphic up to high, it disappears. If you click on the top bar and drag the whole thing around, it comes back. If anybody has a clue to why this is happening, please let me know.

Internet Explorer Only.

It turns out the clipping spans inside of a cell that are smaller than the area in which you are dragging around the graphic make it cranky. One has to simply keep the span outside of the table and move it around when the table moves around. With a little playing around with offsets, you can get a photoshop-layer-like effect. Novel...