Solution to this: See bottom.

Steps to reproduce the issue

create a new joomla 3.3.3 (or higher) page, add some languages (de, en, nl for example) and create a module for the breadcrumbs.
Set a default menu-item (home) for every language and some other ones with submenu-items, to test breadcrumb.

Siehe auch: http://www.joomlaportal.de/joomla-3-x-allgemeine-fragen/314773-breadcrumb-ist-auf-unterseiten-leer-evtl-wegen-mehrsprachigkeit.html#post1562329

Expected result

Breadcrumb should display the menuitems in the breacrumb as pathway like in one-language-sites.

Actual result

only "you are here" is displayed, because jpathwaysite does not return anything.

System information (as much as possible)

Joomla 3.3 and 3.3.6

Additional comments

It can be tested when adding this code into the index.php of a template on the very top:

$app = JFactory::getApplication();
$pathway = $app->getPathway();
$items = $pathway->getPathWay();
print_r($pathway); print_r($items); die();

It only outputs an empty array.

Here's my solution:

open the file: /libraries/cms/pathway/site.php

At line 40 there is this code:

$menus = $menu->getMenu();
$home = $menu->getDefault();
if (is_object($home) && ($item->id != $home->id)) {
...

I changed this code to the following:

$menus = $menu->getMenu();
$home = $menu->getDefault();

// Startpage of multilanguage-pages.
if (empty($home)) {
$lang = JFactory::getLanguage();
$lang_tag = $lang->getTag();
$home = $menu->getDefault($lang_tag);
}
if (is_object($home) && ($item->id != $home->id)) {
...