Where is the topic-tags page template specified?
It seems that the page template for most of the pages is specified in class-shortcodes-php. I ended up having to change the page template here because the functionality to change page templates seems to have disappeared from the plugin. In general, this works. However, when I go to a particular topic tag, such that I am in the topic-tag subdirectory, it reverts to page.php. I can't find where the page template is specified for this so that I can change it.