Index: template.php
===================================================================
--- template.php	(revision 43328)
+++ template.php	(working copy)
@@ -1099,7 +1099,7 @@
 
 	$hidden = get_hidden_meta_boxes( $screen );
 
-	printf( '<div id="%s-sortables" class="meta-box-sortables">', htmlspecialchars( $context ) );
+	printf( '<div id="%s-sortables" class="meta-box-sortables">', esc_attr( $context ) );
 
 	// Grab the ones the user has manually sorted. Pull them out of their previous context/priority and into the one the user chose
 	if ( ! $already_sorted && $sorted = get_user_option( "meta-box-order_$page" ) ) {