Index: wp-admin/includes/user.php
===================================================================
--- wp-admin/includes/user.php	(revision 15333)
+++ wp-admin/includes/user.php	(working copy)
@@ -204,7 +204,14 @@
 	else
 		$level_key = $wpdb->get_blog_prefix() . 'capabilities'; // wpmu site admins don't have user_levels
 
-	return $wpdb->get_col( $wpdb->prepare("SELECT user_id FROM $wpdb->usermeta WHERE meta_key = %s AND meta_value != '0'", $level_key) );
+	$query = $wpdb->prepare("SELECT user_id FROM $wpdb->usermeta WHERE meta_key = %s", $level_key);
+
+	if( !is_multisite() )
+		$query .= " AND meta_value != '0'";
+	else 
+		$query .= " AND meta_value not like '%\"subscriber\"%'";
+		
+	return $wpdb->get_col( $query );
 }
 
 /**
@@ -262,8 +269,12 @@
 		$level_key = $wpdb->get_blog_prefix() . 'capabilities'; // wpmu site admins don't have user_levels
 
 	$query = $wpdb->prepare("SELECT user_id FROM $wpdb->usermeta WHERE meta_key = %s", $level_key);
-	if ( $exclude_zeros )
-		$query .= " AND meta_value != '0'";
+	if ( $exclude_zeros ) {
+		if( !is_multisite() )
+			$query .= " AND meta_value != '0'";
+		else 
+			$query .= " AND meta_value not like '%\"subscriber\"%'";
+	}
 
 	return $wpdb->get_col( $query );
 }