PHP stopped working in site root, only works in subfolders

PHP sites stopped working in the root folder of their respective ISPConfig sites on the entire server (ISPConfig 3 on Ubuntu 10.04.)

For example, a php copied to the site root (...web11/web/) gives the following error:

Code:

_include/home.php_include/home.html Fatal error: Call to a member function appendChild() on a non-object in /var/www/clients/client9/web11/web/_include/home.php on line 142 

But if I copy the relevant php files into a folder inside (...web11/web/x/) it starts to work again.

I do not recall editing php.ini or Apache config files. Anyone got the idea what may have happened here?

 

Does this simple file work in the root folder?

PHP:

<?php
phpinfo();
?>

 

Yes, phpinfo works, but nothing else that's downloaded from somewhere or written by us.

 

Can you check if the PHP include_path in your php.ini is correct?