Here is what worked for me.
in /joomla_root/components/com_fireboard/template/default/fb_layout.php
Delete the Last line after the "?>". This is causing an additional space before the xml proclamation
in /joomla_root/components/com_fireboard/template/default/smile.class.php
Same thing. Delete the Last line after the "?>".
in /joomla_root/components/com_fireboard/sources/fb_rss.php
On (or around) line 57, change:
echo "";
-- to this --
echo "";
I think separating the "?" and the ">" kept from invalid characters from being printed for some reason.
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Mike Cotton
www.cottonwebdesign.com