ZendGuardLoader doesn't show in results of phpinfo()

[batiskaff]

Hello, guys!

I have this configuration of my server:
CentOS 5.6
Plesk 10.X
PHP 5.3.3 (as FastCGI for my current project with custom php.ini)
Zend Guard Loader 3.3

If I check php from a command line I see

# php -v
PHP 5.3.3 (cli) (built: Mar 30 2011 13:51:54)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
with the ionCube PHP Loader v4.0.7, Copyright (c) 2002-2011, by ionCube Ltd., and
with Zend Guard Loader v3.3, Copyright (c) 1998-2010, by Zend Technologies

But I don't see Zend Guard Loader in phpinfo();
I wrote into my custom php.ini necessary directives like in global /etc/php.d/zend.ini
but it doesn't work w/o errors in logs

The custom file (php.ini) works because other directives get me right results.
For example, it works

open_basedir = /var/www/vhosts/site.tld/path:/tmp
safe_mode = Off
date.timezone=Europe/Moscow[/QUOTE]
but this
[QUOTE][Zend]
; comment out next line to disable Zend Guard extension in php
zend_extension=/usr/lib64/php/modules/ZendGuardLoader.so
zend_loader.enable=1
[/QUOTE]
doesn't work...

On forums they say that I should do like this
[QUOTE]
setenforce 0
/etc/init.d/httpd restart
setenforce 1
[/QUOTE] 
but I think that this is not good idea, because it can work utill httpd restarts next time, moreover it may crash the server.

Also I suspect that there is an other way to do it...

Can anybody help me?