Thanks for your reply.
The Cron_log gives:
PHP: Error parsing /usr/local/lib/php.ini on line 786
X-Powered-By: PHP/5.2.17
Pragma: no-cache
Expires: 0
Content-type: text/plain
And underneath it gives the content of update.php. Seems it worked?! :D
I will test it a bit more right now, but I...