doesn't point to the post url

Hello everyone, this is a kinda weird issue. I create a new .txt file in /articles and add to git, commit and push it, then I go to the blog home page, and the description of the new post is there, but when I click to see the entire post in Chrome it says "Oops! This link appears to be broken." and Firefox gives me a 404 error (toto, we're not in Kansas anymore (404)), what is this?

P.S: The blog http://neorubyist.heroku.com/

Thanks :-)

Reproduce the issue by adding a .txt file under /articles, committing and pushing it, then opening the post from the blog home page in a browser. Trace the entry point that generates the home-page post link and compare it with the generated post URL. Done means the new post link opens the full article instead of returning a 404.

Written by the indexing model from the issue text.