Please see the WordPress MU forum ( http://mu.wordpress.org/forums/topic.php?id=7778&page&replies=6#post-46043) and look for my first post where it says "feature and strip" ...
The font changes at that point. It looks like the rest of the thread is formatted like code. I don't know why there's a backtick near the word feature, but even if I did put it there and forgot to close it, is that the reason the entire thread appears formatted like code? If not, please explain.