RSS feed not working since upgrade

Ever since I upgraded to this 3.1.3, I’ve had several issues. Most I’ve been able to either resolve or just get rid of. However, the RSS feed is something I can’t quite get straightened out. It seems I am not generating a valid feed for whatever reason. Here is the error I receive when I attempt to validate my rss feed:
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This feed does not validate.
• Server returned HTTP Error 301: The HTTP server returned a redirect error that would lead to an infinite loop. The last 30x error message was: Moved Permanently [help]
• line 1, column 0: XML parsing error: <unknown>:1:0: no element found [help]

In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendation.
• Feeds should not be served with the “text/html” media type [help]
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My blog is at scheumann.us, if that helps. I have tried de-activating all plug-ins and widgets as well as other tips on this and other boards. I’m at a loss. Any help is greatly appreciated.
Thanks, Scheu