RSS feed not working for the blog – only categories

I just upgraded to WP 2.1.3 – It was all nice and dandy until 4 hours ago. The blog RSS feed returns a 404 error. Since my feeds are though Feedburner – here is the error message

Feed Address: http://feeds.feedburner.com/iqi-strategic-management-inc

HTTP Error Code: 500

Detail: There was a problem retrieving the feed: com.burningdoor.rsspp.resource.impl.HttpConnectionException: Error getting URL: 404 – Not Found

The blog feed is http://www.iqi-sm.com/blog/index.php/feed/

However, if I lookup the feed for a category http://www.iqi-sm.com/blog/index.php/category/strategy/feed/
it works like a charm. Can anyone help me out please?

Thanks