Hi,
currently Gene and I are testing the upcoming Thematic release against WordPress 3.0.
If you can't wait please read this post first: http://developing.thematic4you.com/2010/04/breaking-things-to-fix-others/
If you still can't wait, you can grab the latest SVN copy from: http://code.google.com/p/thematic/
Or download something that is considered a stable development release running on all of my blogs: http://developing.thematic4you.com/thematic-development-release/
Thematic won't use wp_nav_menu() out of the box, because I don't want to break any child theme.
If you created only one wp_nav_menu or the one that you're going to use as the primary menu is the first one you created, just add the following code to your child theme's functions.php:
function change_menu_type() {
return 'wp_nav_menu';
}
add_filter( 'thematic_menu_type', 'change_menu_type' );
If you have more than one menu or you want to use the second or third one in the list, you need to add some additional code to your child theme's functions.php:
function switch_menu( $args ) {
$args[ 'menu' ] = 'test-menu';
return $args;
}
add_filter( 'thematic_nav_menu_args', 'switch_menu' );
This code can be extended with conditional tags to load specific menus for a certain template, page, post, and so on.
Chris