HTML Code:
{php}
include("http://madhatterrgames.com/rss2html.php?XMLFILE=http://madhatterrgames.com/phpBB3/generate_feed.php%3fcontent%3dposts%26f%255B%255D%3d17%26number_items%3d1%26sid%3d3043e6c2e27b05430edc3ddff7d95c4b&TEMPLATE=http://madhatterrgames.com/sample-template.html&MAXITEMS=1");
{/php}
should not work due to security reasons
You have to specify not the URL of the file, but path to it from the directory where your store is located
Cleanup templates cache with
HTML Code:
http://madhatterrgames.com/pathToYourStore/cleanup.php
in your browser before proceed and try
HTML Code:
{php}
include("rss2html.php?XMLFILE=/phpBB3/generate_feed.php%3fcontent%3dposts%26f%255B%255D%3d17%26number_items%3d1%26sid%3d3043e6c2e27b05430edc3ddff7d95c4b&TEMPLATE=sample-template.html&MAXITEMS=1");
{/php}
if rss2html.php is located in the folder with your store.