I can't give a link since it's internal but when I use the link on a browser, it works fine. It only gives me those errors in vBulletin. Also, I looked around for a mismatched tag but didn't find one and since the Bugzilla RSS link works normally, I can't figure out what vBulletin isn't liking.
--------------- Added [DATE]1196197309[/DATE] at [TIME]1196197309[/TIME] ---------------
Now, I think it's that Bugzilla is putting out an Atom feed and maybe that's not supported by vBulletin? If anyone has any workarounds, I'd be ecstatic to know