I'm trying to use Feedburner with a blog but it keeps rejecting the feed because the XML declaration starts on the second line.

How do I remove that first line from the feed?

I've tried adding

$body = ltrim($body);

to outputToBrowser in RSSFeed.php but that doesn't change the output.

Any suggestions?

I had this problem in the past (pre 2.3.0) and found a fix but can't remember how I made it work. I'm currently using 3.3.2 beta 1.

The (very crude) fix for this is to strip the XML statement from the start of the feed. In sapphire/api/RSSfeed.php, line 189 is:

echo $body;

I added a new line above to remove the XML declaration:

$body=str_replace("<?xml version=\"1.0\"?>","",$body);
echo $body;

The feed now validates in Feedburner so I am assuming it is valid for the majority of browsers.