[YouTube-API] Script in browser works, but hangs as a cronjob

In a cronjob file (written in Php) I have the following two lines:

require_once ('Zend/Loader.php'); // the Zend dir must be in your include_path

Zend_Loader::loadClass('Zend_Gdata_YouTube');

When I run the file in a browser everything works fine. But when I use it for a cronjob the script hangs on the second line. I don't see the problem, but hopefully somenone here does

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