If you have updated to BuddPress 1.6 and forgot to check this option while updating-
If you’d prefer to not switch the WordPress Toolbar just yet, check this box. don’t worry you caan change your mind later.
Then you will be seeing your WP toolbar instead of BuddyBar. If you want to disable WordPress toolbar and revert back to BuddyPress Bar, add the following code in your bp-custom.php file:
add_filter( ‘bp_use_wp_admin_bar’, ‘__return_false’ );