FYI, I've updated the code for the BuddyPress bar in bbPress:
http://buddypress.org/forums/topic.php?id=1152#post-18510

It uses bbPress' header and footer hooks, instead of WordPress'.
The BP bar now also works in the bbPress admin area as well!

require_once( $_SERVER['DOCUMENT_ROOT'] . '/wp-blog-header.php' );

this seems to work fine, but I've noticed another problem...when you go to the admin page to administer the forum, I get a failure again, like this:

Warning: require_once(../wp-blog-header.php) [function.require-once]: failed to open stream: No such file or directory in /home/alumnide/public_html/forum/bb-config.php on line 5

Fatal error: require_once() [function.require]: Failed opening required '../wp-blog-header.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/alumnide/public_html/forum/bb-config.php on line 5

has anybody else gotten past this error?

Fatal error: Call to undefined function wp_head() in /home/alumnide/public_html/forum/bb-templates/kakumei/header.php on line 33

am I still missing some code?

1. Created a function called functions.php inside my template folder (bb-templates/kakumei/functions.php) and put in it the code:

function recreate_bb_admin_bar() {
echo '<div id="wp-admin-bar"><ul class="main-nav">';
bp_adminbar_logo();
bp_adminbar_login_menu();
bp_adminbar_account_menu();
bp_adminbar_blogs_menu();
bp_adminbar_notifications_menu();
bp_adminbar_authors_menu();
bp_adminbar_random_menu();
echo '</div>';

}

add_action( 'wp_footer', 'recreate_bb_admin_bar', 8 );
add_action( 'admin_footer', 'recreate_bb_admin_bar' );
add_action( 'wp_head', 'bp_core_admin_bar_css', 1 );

2. Added to my bb-config.php file, this line
require_once('../wp-blog-header.php');

Am I still missing something? Thanks

Best wishes,
Allen

http://bbpress.org/forums/topic/bbpress-wpmu-and-buddypress-integration-help-is-coming

Doesn't look like the linked-to pages have been updated yet.

Thanks