woothemes/woocommerce — pull request #1423 by kingbt (2012-08-24 14:05:22+00:00)
Title: Update templates/shop/breadcrumb.php

[code]if ( get_option('woocommerce_prepend_shop_page_to_urls')=="yes" && woocommerce_get_page_id('shop') && get_option('page_on_front') !== woocommerce_get_page_id('shop') )[/code]
The deleted line makes the Shop trail not to show on single product pages.
Now, deleted, the breadcrumb trail for product is Home > Shop > Catergory > Title
The breadcrumb does not show up on front page, even if Shop page is set to Home page and this is ok.