Fix the RSS feed on my blog - random space outside PHP command

This is my blog. [login to view URL] If you go to the bottom of the page and click on RSS feed it is broken on every browser except IE. The comments RSS feed works [[login to view URL]][1] is broken [[login to view URL]][2] works This is an extremely well documented problem in WordPress RSS feeds. Lots written on it, with the answer being 'look through the php for a blank line'. I have looked in a lot of files. And deactivated all my plugins. And swapped to the 2010 theme. None of which solved it. So either I am missing something obvious (very possible) or it is a space in an obscure PHP file that I did not see. Here is a description of the problem: <[login to view URL]> Here is the advice that is given: <[login to view URL]> Can you troubleshoot and fix this for me please? Thanks!