Index: wp-activate.php
===================================================================
--- wp-activate.php	(revision 15068)
+++ wp-activate.php	(working copy)
@@ -23,6 +23,9 @@
 }
 add_action( 'wp_head', 'do_activate_header' );
 
+// Fix for page title
+$wp_query->is_home = true;
+
 function wpmu_activate_stylesheet() {
 	?>
 	<style type="text/css">
Index: wp-signup.php
===================================================================
--- wp-signup.php	(revision 15068)
+++ wp-signup.php	(working copy)
@@ -33,7 +33,7 @@
 }
 
 // Fix for page title
-$wp_query->is_404 = false;
+$wp_query->is_home = true;
 
 function wpmu_signup_stylesheet() {
 	?>