Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 24343)
+++ wp-admin/includes/template.php	(working copy)
@@ -1010,7 +1010,7 @@
 					$i++;
 					$hidden_class = in_array( $box['id'], $hidden ) ? 'hide-if-js' : '';
 					?>
-					<li class="control-section accordion-section <?php echo $hidden_class; ?> <?php echo esc_attr( $box['id'] ); ?>" id="<?php echo esc_attr( $box['id'] ); ?>">
+					<li class="control-section accordion-section open <?php echo $hidden_class; ?> <?php echo esc_attr( $box['id'] ); ?>" id="<?php echo esc_attr( $box['id'] ); ?>">
 						<h3 class="accordion-section-title hndle" tabindex="0" title="<?php echo esc_attr( $box['title'] ); ?>"><?php echo esc_html( $box['title'] ); ?></h3>
 						<div class="accordion-section-content <?php postbox_classes( $box['id'], $page ); ?>">
 							<div class="inside">