@markstory Seems to be a directory separator thing, from travis:

"/home/travis/build/cakephp/cakephp/tests/test_app/TestApp/Template/Cell/TestApp\View\Articles/teaser_list.ctp" is missing.' in /home/travis/build/cakephp/cakephp/src/View/View.php:991

    /TestApp\View\Articles/

The only possible cause I found was in `Cell::__toString()`:

    $this->View->viewPath = 'Cell' . DS . substr($className, 0, strpos($className, 'Cell'));

is this wrong?