maybe some of you scripts require more memory than in you php limits
Server specs
>
> Ubuntu 9.10
> PHP 5.3.3-0.dotdeb.1 (fpm-fcgi) (built: Oct 1 2010 08:21:13)
> Nginx
>
> Posted at Nginx Forum:
> http://forum.nginx.org/read.php?3,158805,158807#msg-158807
>
>