For some reason, LiveJournal are placing a comment at the head of feeds, example:
http://madas.livejournal.com/data/rss
http://madas.livejournal.com/data/atom

They added it recently, and it caused aggregator2_parse_xml to return a "parse error" on line 1. I am not sure if having a

makes an invalid XML, because Firefox displays it fine.

I tried to strip away any leading comments before calling the xml parser without success. I would really appreciate having it fixed as it had broken aggregation from livejournal blogs for my planet site.