Articles which contain ```
``` blocks are displayed (in "feed" mode) with the content of the ```
``` all on one line, which is almost always wrong.
See for instance any of the most recent articles on [http://smallcultfollowing.com/babysteps/](http://smallcultfollowing.com/babysteps/)
I’ve had the same problem as well; looks like line wrapping is entirely disabled in pre elements. (I subscribe to some Gmane e-mail list RSS feeds, and they wrap the entire message content in pre tags, which then produce incredibly long lines on NB.)
Ditto for The Daily WTF (thedailywtf.com). Check out this article for a good example: