Page Templates in 2.7.1

Hi, I upgrade to the 2.7.1 version and then the template selector for pages disappears.
I have almost two templates with the comment code in the first lines to say that they are templates, and worked with the older version.
I dont know if I do something wrong or this version have a problem or work with another code.
the code I use is:
<?php
/*
Template Name: template
*/
?>

Sorry about my english.
Thanks a lot.