Thorsten,
> I did track it down to a call to strtotime inside Smarty -- it
> appears to just hang/spin when called with just a single numeric
> argument (number of seconds since epoch), if that is not prepended
> with '@' as the documentation says it should be.
>
> This was a call happening in include/Smarty/plugins/
> shared.make_timestamp.php
>
Let me guess, you are running that under AMD64, right?
http://bugs.php.net/bug.php?id=30215
and the original source:
http://www.joestump.net/193251484/running-apache-mysql-php-on-debian-amd
64.html
You can try changing the Smarty source like he suggests, and it should
fix it for you.
--Joao