Gzip compression misteriously disappears

Hello everyone, i´m having trouble getting my Gzip compression stable.

My site is http://lenguajecorporal.org. I´ve got WordPress on Godaddy´s linux hosting and added this line of code:

<?php if (substr_count($_SERVER[‘HTTP_ACCEPT_ENCODING’], ‘gzip’)) ob_start(“ob_gzhandler”); else ob_start(); ?>

…to the very top of my header and main index. Last night I checked out in all these services:

http://www.gidnetwork.com/tools/gzip-test.php
http://www.whatsmyip.org/http-compression-test/
http://checkgzipcompression.com/

And every one of them (except Google Speed Test) determined I had GZIP enabled. Today, it´s gone, and I didn´t change anything :/

Here´s my .htaccess file:

# compress text, html, javascript, css, xml:
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
AddType x-font/otf .otf
AddType x-font/ttf .ttf
AddType x-font/eot .eot
AddType x-font/woff .woff
AddType image/x-icon .ico
AddType image/png .png
AddType text/css .css

<ifModule mod_expires.c>
ExpiresActive On
ExpiresDefault “access plus 1 seconds”
ExpiresByType text/html “access plus 1 seconds”
ExpiresByType image/gif “access plus 2592000 seconds”
ExpiresByType image/jpeg “access plus 2592000 seconds”
ExpiresByType image/png “access plus 2592000 seconds”
ExpiresByType text/css “access plus 604800 seconds”
ExpiresByType text/javascript “access plus 216000 seconds”
ExpiresByType application/x-javascript “access plus 216000 seconds”
</ifModule>

<ifModule mod_headers.c>
<filesMatch “.(ico|pdf|flv|jpg|jpeg|png|gif|swf)$”>
Header set Cache-Control “max-age=2592000, public”
</filesMatch>
<filesMatch “.(css)$”>
Header set Cache-Control “max-age=604800, public”
</filesMatch>
<filesMatch “.(js)$”>
Header set Cache-Control “max-age=216000, private”
</filesMatch>
<filesMatch “.(xml|txt)$”>
Header set Cache-Control “max-age=216000, public, must-revalidate”
</filesMatch>
<filesMatch “.(html|htm|php)$”>
Header set Cache-Control “max-age=1, private, must-revalidate”
</filesMatch>
</ifModule>

My site is cached through Sucuri.net´s CloudProxy.

Thanks in advance!