with nginx vhosts do not work - Recent ehcp + ubuntu 10.10 + nginx + php 5.3

Hello,

My problem is, nginx working well with the control panel and chive (mysql webadmin tool), webmail etc., but all vhosts does not execute any php code.

I am able to get back html files correctly, but index.php (any php files) simply does not work. I got nothing to the logs, simply seems it is ignored or similar.

Does anybody have idea, what to check now?

Thanks!
István