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Problem

Including nested templates no longer works with MW 1.12s new parser behaviour.

Pre 1.12 behaviour

{{#dpl:title=Random|include={Template Name}:Parameter}}

Reply

This is surprising! As far as I understand the new MW parser version will never allow the kind of constructs you mention. http://svn.wikimedia.org/svnroot/mediawiki/tags/REL1_12_0RC1/phase3/RELEASE-NOTES contains a chapter on parser changes which states that the parsing sequence has intentionally been changed and now no longer supports the construction of template code by other templates.