Error in RSS feed after upgrade to WordPress 2.8.2

Hi!

I finally bit the bullet and upgraded my wordpress from version 2.6.1 to 2.8.2. Everything went very smoothly except for the fact that my RSS feed stopped working. Both IE and Chrome say that my site’s RSS feed has errors. I never ever touched my RSS feed code. It has always worked like a charm.

My RSS feed is http://feeds.feedburner.com/gadgetmix

Here is the error given by IE:

This feed contains code errors

..and this is the error given by Chrome

This page contains the following errors:

error on line 756 at column 1: Extra content at the end of the document
Below is a rendering of the page up to the first error.

What changes (if required) I need to do to make the RSS feed functional again?

PS: Firefox displays it without errors.