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August 7, 2015 at 1:40 AM #2455
Custom post templates are an exclusive creation of StartupWP, we’re not aware of any other theme in the world that supports custom post templates. With that in mind, this is a very special feature and not widely supported. Not sure why exactly a child theme would throw a wrench in the works, but the easiest way to create a new post template is to just copy one of the others (template-sidebar-none-post.php is probably the closest to the default post template), change the filename and change the bit at the top:
<?php /* Template Name Posts: Sidebar None */ ?>