Why does my bookmark not work anymore?

I had a bookmark which takes me directly to the new questions: http://moms4mom.com/questions?sort=newest But I get a 404 every time I use it now. If I click the logo from that page, and then navigate to "Newest" which is what I'm interested in to answer questions, the URL reads http://moms4mom.com/questions/?sort=newest again, but if I bookmark that, rinse, repeat. Is there some referrer checking that messes this up? It's a bit annoying, to be honest.