Getting HTTP 500 Error

[Demontager]

I'm trying to setup Nginx+phpFPM for first time (php5.2) and can't get it
working. Base system is FreeBSD 9.1.
So my main configs:

nginx.conf  -  http://pastebin.com/KwhHr0NK
php-fpm.conf -  http://pastebin.com/KQBwp3KL
vhost config -  http://pastebin.com/qyFzc9Xa

Nginx started and working as i may see output from phpinfo(), but if i put
something comlex, eg. CMS like Drupal, WP, Joomla it generates HTTP 500
error. 

Also I can't see any php errors in logs despite they are defined in
php-fpm.conf

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,236937,236937#msg-236937