the-plainview/threewp_broadcast — pull request #6 by gish (2013-03-04 15:29:32+00:00)
Title: Fixes bug for updating terms where no terms selected at master post

Related: http://wordpress.org/support/topic/changes-in-taxonomy-are-not-propagated?replies=2

I'm not quite sure if my update has any side-effects, since I removed the statement about unsetting array values. As far as my testing goes, everything works fine.