Index: wp-admin/includes/list-table.php
===================================================================
--- wp-admin/includes/list-table.php	(revision 15634)
+++ wp-admin/includes/list-table.php	(working copy)
@@ -238,7 +238,7 @@
 			return;
 
 		echo "<select name='action$two'>\n";
-		echo "<option value='-1' selected='selected'>" . __( 'Bulk Actions' ) . "</option>\n";
+		echo "<option value='0' selected='selected'>" . __( 'Bulk Actions' ) . "</option>\n";
 		foreach ( $this->_actions as $name => $title )
 			echo "\t<option value='$name'>$title</option>\n";
 		echo "</select>\n";