Other Blogger supplied features may stop working, after the blog is changed to use a third party template, or after the template code is tweaked using "Edit HTML" - maybe when installing a third party commenting system.
In many cases, failure of a post related feature to work consistently, or at all, is caused by the lack of supporting code in the post template. Generally, when someone reports such a problem in BHF: Something Is Broken, the advice to refresh the gadgets, or the post template, will be given. Some forum helpers may grow to see the advice, now given as
From Template - "Edit HTML", select "Revert widget templates to default", and select "Blog1".as a magic wand, to be waved over any blog with a problem.
There is no magic in the post or widget templates - and many problems with the posts can be resolved in several different ways.