Symptoms
Strange boxes or '?' are displaying in my email receipts
Cause
This is caused by a Microsoft Security update that affects how some machines handle unicode characters.
Solution
This can be corrected by editing the notification.****.xml.config files found in the /xmlpackages folder.
Procedure
Locate the following line in your xml file:
<XSL:output method="html" omit-xml-declaration="yes" encoding="ISO-88590-1" />
and change it to:
<XSL:output method="html" omit-xml-declaration="yes" encoding="UTF-16" />