I am trying to create a child theme. When I include functions.php the site appears to work OK, but meta functions (login, logout, update post, etc.) create the Cannot modify header fault, like this:
Warning: Cannot modify header information - headers already sent by (output started at /homepages/9/d271285184/htdocs/wp-content/themes/twentyten-child/functions.php:1) in /homepages/9/d271285184/htdocs/wp-login.php on line 354
There is no extra white space in functions.php.
I have reduced functions.php to an open tag, comment, and close tag; the fault persists.
The Twenty Ten theme exhibits this behavior, as does the Arjuna-X theme.
I have disabled all plugins.
Here's the functions.php file:
<?php // comment ?>
I've documented what I've done on this page:
I'm sure I am missing something obvious. Any help is appreciated.