403 Forbidden error from specific htaccess Rewrite
===

I am using `.htaccess`' `RewriteRule` to redirect a url to the proper page for a client, everything works fine, except for Rewriting the word catalogue! I get a 403 forbidden error.

This is my code:

    <IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteRule ^catalogue$ /catalogue.php
    </IfModule>

This results in this: 

![enter image description here][1]


  [1]: http://i.stack.imgur.com/vFHCY.png

Now, what is driving me crazy is, if i switch the code to `RewriteRule ^catalog$ /catalogue.php` or `RewriteRule ^cataloguee$ /catalogue.php` and browse to the respective url, the page displays without the error.

Any ideas why this is occuring?