[Plugin: NextGEN Scroll Gallery] thumb scroll on rollover not working

I love the UI on this plugin, but I can’t seem to get the rollover function on the thumbnails to scroll to the next thumb. I can click on the image to advance to the next, and I can hold shift and use the scroll wheel on my mouse to move the thumbs back and forth, but mouse rollovers don’t do it. I am using this theme: http://ww.wp.xz.cn/extend/themes/sliding-door Please help ASAP!

http://ww.wp.xz.cn/extend/plugins/nextgen-scrollgallery/