Any idea why both the home and blog menu items are highlighted when visiting the blog at this site?

http://brianfey.com/blog/

Because they both have the class 'current_page_item'. Now,
1) how did you create your menu?
2) what is the front page pointing at (dashboard->setting->reading->Front Page displays?

Thanks for responding.

1. I created this menu in Atahualpa theme options - it is an older version of the theme - I can't actually figure out which version it is. :S
2. Front page is pointing at the "Home" page.

What version of wp?

wp version 3.1

go look at the option ATO->MENU 1 (Page Menu)->Home link in Page Menu Bar

Yes, it is set as "Home".

Make it blank

Sure, but then my "Home" page doesn't show up in the menu: http://brianfey.com

I suggest you install Atahualpa 3.5.3 and the BUGFIX's that go with it, (See the 'New versions & Updating' forum) - I'd do a manual install. Then add back the 'Home' in the 'Home link in Page Menu Bar'

the version of Atahualpa you have doesn't support the new menu classes in the latest version of WordPress.

You should be able to see the version of Atahualpa by going to the theme picker - it should show there, or you can edit the style.css and the version number should be in it.

Arg. I've been putting off doing any upgrades since my first attempt temporary locked me out of a blog. I'll give it a shot, thanks!