I am attempting to use the methods found here on the official site: http://vip.wordpress.com/documentation/list-posts-by-a-co-author/
However, it does not result in a loop. And, yes, I have inserted my template structure where it says "// Do your presentation".
Both $coauthor and subsequently $coauthor_term fail to return any results as well.
Am I missing something obvious here, or is there a bug?