Index: pluggable.php
===================================================================
--- pluggable.php	(revision 4201)
+++ pluggable.php	(working copy)
@@ -18,7 +18,7 @@
 
 	$current_user = new WP_User($id, $name);
 
-	setup_userdata($current_user->ID);
+	setup_userdata($current_user->id);
 
 	do_action('set_current_user');
 
Index: user.php
===================================================================
--- user.php	(revision 4201)
+++ user.php	(working copy)
@@ -153,13 +153,13 @@
 	else 
 		$user = new WP_User($user_id);
 
-	if ( 0 == $user->ID )
+	if ( 0 == $user->id )
 		return;
 
 	$userdata = $user->data;
 	$user_login	= $user->user_login;
 	$user_level	= $user->user_level;
-	$user_ID	= $user->ID;
+	$user_ID	= $user->id;
 	$user_email	= $user->user_email;
 	$user_url	= $user->user_url;
 	$user_pass_md5	= md5($user->user_pass);