After upgrading to 3.1 I am seeing this issue.
I use custom post types and when you click on the menu items either Games, Entertainment or Tech it gets the class current-menu-item but home link still has it also.
I am using the custom menu's built into WordPress and for the links and they are just custom links pointing to:
- Home: http://www.flesheatingzipper.com
- Games: http://www.flesheatingzipper.com/games/
- Entertainment: http://www.flesheatingzipper.com/entertainment/
- Tech: http://www.flesheatingzipper.com/tech/
- About: Links to page, about
Here is the site: http://www.flesheatingzipper.com/