Geo targeting ads issue – Magiks script/plugin

Hi,

I bought the geo country bundle from this site: http://geotargetingscripts.com

I have problems implementing it. I don’t know why but the ads do not change by changing location.
This is my code:

<?php
if (class_exists('magiks_geo_shortcode_class'))
{
$rand = rand(0,1);
if($rand == 1)
   echo do_shortcode('
   [m_geocountry locations="BU"] <a href="http://www.example.com/?aff=1"><img src="http://www.example.com/example_BU.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="AR"] <a href="http://www.example.com/?aff=1"><img src="http://www.example.com/example_AR.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="FR"] <a href="http://www.example.com/?aff=1"><img src="http://www.example.com/example_FR.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="US"] <a href="http://www.example.com/?aff=1"><img src="http://www.example.com/example_US.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="MR"] <a href="http://www.example.com/?aff=1"><img src="http://www.example.com/example_SW.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="MR,US,FR,AR,BU" display="0"] <a href="http://www.example.com/?aff=1"><img src="http://www.example.com/example.jpg" /></a> [/m_geocountry]
   ');
elMR
   echo do_shortcode('
   [m_geocountry locations="BU"] <a href="http://www.example.com/?aff=2"><img src="http://www.example.com/example_BU.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="AR"] <a href="http://www.example.com/?aff=2"><img src="http://www.example.com/example_AR.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="FR"] <a href="http://www.example.com/?aff=2"><img src="http://www.example.com/example_FR.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="US"] <a href="http://www.example.com/?aff=2"><img src="http://www.example.com/example_US.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="MR"] <a href="http://www.example.com/?aff=2"><img src="http://www.example.com/example_SW.jpg" /></a> [/m_geocountry]
   [m_geocountry locations="MR,US,FR,AR,BU" display="0"] <a href="http://www.example.com/?aff=2"><img src="http://www.example.com/example.jpg" /></a> [/m_geocountry]
   ');
}

I am working with W3TC (WordPress Total Cache), so also thought that this could be an issue of caching. Tried to wrap a code around the code above, that will prevent caching this specific code:
<!-- mfunc -->PHP code<!-- /mfunc -->

Didn’t help me….

Can you please advice..?

Many thanks!