[Plugin: All in One SEO Pack] Feed does not validate

The latest plugin release kills RSS feeds on two sites.

XML Parsing Error:

line 2, column 0: XML parsing error: <unknown>:2:0: xml declaration not at start of external entity [help]

    <?xml version="1.0" encoding="UTF-8"?><feed

Feeds come back alive after deactivating this plugin.

http://wordpress.org/extend/plugins/all-in-one-seo-pack/