http://www.phpbb.com/mods/modx/sample-30-125.xml (Linked from http://www.phpbb.com/mods/modx/

Appears blank in Google Chrome 5 Beta

I believe the cause is because the following line is not present:

<?xml-stylesheet type="text/xsl" href="modx.prosilver.en.xsl"?>

EDIT: The following line is missing as well:

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>