I tried to work around it by using FeedBurner, but I get this error message on FeedBurner's end:
The URL does not appear to reference a valid XML file. We encountered the following problem: Error on line 2: The processing instruction target matching "[xX][mM][lL]" is not allowed.
It seems like something might be misconfigured with your blog feed? Maybe the content type is not being served correctly?