Plone 4.3 has disabled plone_deprecated CMF layer by default (see https://github.com/plone/Products.CMFPlone/commit/90d9ab4e1957fa206cf5ea2d602d691d2ac22c58). This broke the default Collage view as it was using here/document_relateditems/macro/relatedItems. This would probably break pre-Plone4 setups where the relatedItems viewlet is not in place, maybe it's worth to note it in the documentation, however, the drawback will be that the related items whould not show... which it's not a great deal in a WindowZ object...