I ran the RSS xml file through W3C's RSS validator. The results say:
line 2, column 0: XML parsing error: <unknown>:2:0: XML or text declaration not at start of entity
I'm not sure how to approach this one. I searched on drupal.org and found these:
Based on the 2nd link, I tried placing an echo in the current template.php being used and the output appeared after the space right before the XML tag. That means the extra line in the RSS XML was placed there before the theming was invoked, right? Where should I look?