Why is Autoblog Plugin not retrieving information?

I have about 35 feeds listed in AutoBlog. About 40 percent of them have been validated with no errors while 50 percent comeback as valid but also with the "This feed is valid, but interoperability with the widest range of feed readers could be improved by implementing the following recommendations" message. The other 10 percent are coming back as not valid at all even though I entered the exact rss url found on the site. As of right now AutoBlog is not working at all. So why is no information at all being retrieved even by those that are completely valid? What should I do to fix the error message on the other 50 percent of the feeds?