Yes, I'm having the same problem. The built-in National Geographic Magazine recipe downloads the same October 2013 articles every month.
I believe this is because the date is hard coded in the link to the magazine's table of contents. Here's the code:
def nejm_get_index(self):
return self.index_to_soup('http://ngm.nationalgeographic.com/2013/10/table-of-contents')
I was able to get the November and December issues by changing the date in the link to 2013/11 and 2013/12. I don't know how to make these dates variables so I'm changing the recipe manually each month.