Scrollpane mask clips mc wrong

1

I’m using the scrollpane component to scroll an MC horizontally. For some reason, the mask in the scrollpane is clipping about 20px from the bottom of the MC. Masking on the left and right side work as it should. If I comment out the setMask in the scrollpane script, the MC isn’t clipped. Here’s how I’m calling the pane:


this.attachMovie("FScrollPaneSymbol", "scroller_sp", 1, {_x:-208, _y:-18});
scroller_sp.setSize(472, 145);
scroller_sp.setHScroll("auto");
scroller_sp.setVScroll("false");

this.attachMovie("i_thumbholder", "thumbholder", 2, {_x:-208, _y:-13});
scroller_sp.setScrollContent(thumbholder);

Is there a problem with the depths? How can I fix this?

Thanks

Jason