[Plugin: NextGEN Gallery] Slideshow doesn't load?

I’m trying to insert a slideshow into a page, and it won’t load – just spins for minutes. I’ve tried resizing images to be smaller, uninstalling/reinstalling the plugin, and played around with using different formats. The gallery works just fine within the exact same page and with the same images. When viewing the gallery as an overlay it loads with no issue, so I don’t think this is a problem with my image sizes…any ideas?

Here’s the page:

http://www.landmarkventures.com/israeldealmakerssummit/about-the-summit/

Thank you!!

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