It seems that the "Creator" information in an RSS feed is picked up by the FR parser, whether it's in a <dc:creator> tag or an <author> tag, but FR misses the same information in an Atom version of the same feed. Here's an example of two identical feeds, one RSS 2.0 and one Atom 1.0:
http://www.syrinx.net/node/411/feed/rss
http://www.syrinx.net/node/411/feed/atom
Both feeds contain the appropriate <author> and <dc:creator> tags and the proper xmlns:dc="http://purl.org/dc/elements/1.1/" declaration. FR only sees the author information in the RSS feed. In fact, I took out the Dublin Core stuff in the RSS feed and FR still picked up the information from the <author> tag.
It's a small but annoying little bug which causes me to use RSS when I would really rather use Atom.
Download new EXE and tell me
Download new EXE and tell me if it fixes your problems :).