The problem may be that WordPress (wp-rss2.php) is not sending the <language>en</language> parameter. While not required by the RSS 2.0 spec, audio.weblogs.com requires it…
“1. Although the channel-level language element is not required by the RSS 2.0 spec, we require it. This is because, should there be more growth, which seems likely, we’ll be able to produce separate lists based on language. This is a common feature request, so I think it’s worth having that data for each feed.”
See this link for more info…
http://www.ipodder.org/2004/10/19#a255
Good luck!
Richie
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Richie Carey’s Web Log & Podcast
http://www.RichieCarey.com/