Source Mode Changes Charachters inside php Tags

Hi

I am using the FCKeditor 2.1.1

I have folowing Problem
entering :

This is <strong>regular</strong> content. <hr />
<pre><?php
include '/GB/gbook.php';
?></pre>
<hr /> This is after the PHPinfo. ''

into the Source mode leads to:

This is <strong>regular</strong> content. <hr />
<pre><?php
include &#39;/GB/gbook.php&#39;;
?></pre>
<hr /> This is after the PHPinfo. '' // Notice, these two '' stay untouched! 

Witch offcourse reults in an PHP error.
I have:
FCKConfig.ProcessHTMLEntities = false ;
FCKConfig.IncludeLatinEntities = false ;
FCKConfig.IncludeGreekEntities = false ;
given.
Help would be appriciated!
Thx,
Chris