I have a news feed I am using, It works great when I manually process the feed. When Autoblog runs on it's own it get an error and doesn't pull down the posts.
Here is the Autoblog error: This XML document is invalid, likely due to invalid characters. XML error: Reserved XML Name at line 2, column 38
Here is the feeds XML file: http://www.dailyrepublic.com/author/eheal/feed/
Here is Feed Validation Service: http://validator.w3.org/feed/check.cgi?url=http%3A//www.dailyrepublic.com/author/eheal/feed/