add_image_size() stops working

Hi, i have an issue and need help, since i moved to this new hosting the add_image_size() stops working..

I call post-thumbnails.php in to functions.php using this:
require_once(TEMPLATEPATH . ‘/includes/post-thumbnails.php’);

this is the function inside post-thumbnails.php:

if ( function_exists( ‘add_theme_support’ ) ) {

add_theme_support( ‘post-thumbnails’ );

add_image_size( ‘featured-thumb-small’, 200, 130, true );
add_image_size( ‘featured-thumb-large’, 430, 410, true );
add_image_size( ‘home-entry-thumb’, 150, 150, true );
add_image_size( ‘entry-bottom-thumb’, 100, 60, true );
add_image_size( ‘entry-blog-thumb’, 50, 50, true );
};

Example in the template:

<?php the_post_thumbnail(‘entry-blog-thumb’, array(‘class’ => ‘entry-thumb’)); ?>

always worked, but now I changed my hosting and does not work.. anyone have a clue?