FastCGI can't use PHP session

[Balles]

Hello

I have tried with this solution (http://kb.parallels.com/7056), but makes no effect. When I change from "Apache Module" to "FastCGI" in control panel, plesk regenerate a new php.ini for the vhost. And when I change php.ini for a host I have no results. I have tried with /usr/local/psa/admin/sbin/httpdmng for reconfigure a vhost but the configuration of php.ini don't load.

How can I load the new custom configuration of php.ini for a vhost?

Thank you,

Linux 2.6.18-274.12.1.el5
Centos 5.7
Plesk 10.4.4 MU #10