Thanks for replying.
But those links are no help.
I just found this lines on the cart php that may hold my answer:
<td class="product-thumbnail">
<?php
$thumbnail = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image(), $cart_item, $cart_item_key );
if ( ! $_product->is_visible() ) {
echo $thumbnail;
} else {
printf( '<a href="%s">%s</a>', esc_url( $_product->get_permalink( $cart_item ) ), $thumbnail );
}
?>
</td>
Is there any thing in there that is preventing thumbnails to show in cart ?