Well, theres a line return before the feed; which may be the cause; UBBDevs work fine clicky so i'm not sure why it's not working for your site...

Can you try clearing your cache on your forum and see if that fixes it? After that you could try opening the template "rss_xml.tpl" and make sure that the top two lines are:
Code
{* Script Version 7.5.7 *} 
<?xml version="1.0" encoding="ISO-8859-1" ?>

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