[Plugin: WordPress SEO by Yoast] breadcrumbs crash site

I recently installed WordPress SEO by Yoast and noticed once activated, my site would not longer come up – just a blank page. I deactivated the plug-in and it comes right back. I dug a litter deeper and one-by-one disabled parts of the plug-in and discovered enabling breadcrumbs is the culprit. With breadcrumbs turned off, my site works fine. Any ideas why this would be?