I have installed Minifrontpage version 3.1.0 and it works just fine on all but one page, https://thefireplace.com.au/heating/biofuel-fires/icon-fires
which, when Minifrontpage is activated, goes blank and has no source code.
This suggested to me an extension conflict and so I created a "bare bones" page which contains only an article and no other extensions. This page was not a duplicate of another with extensions switched off but was built as a new page. The URL of this page is https://thefireplace.com.au/heating/biofuel-fires/icon-fires
-3 and is accessible only to Super Users. I also created a new Minifrontpage module for this page. This page also goes blank with no source code when the Minifrontpage module is activated.
Given that Minifrontpage works on all other pages it cannot be a server problem nor a Joomla version (3.9.10) problem.
Server information is at https://thefireplace.com.au/info.php
Can you assist please?