Prior to 3.4 I had a modification in author.php that worked as follows:
redirected to author.php that in turn redirected to "authorname"'s most recent post. (Simply if statement that looked up 'authorname' in the db). Since 3.4, this no longer works and returns a 404. In particular, the url above does not appear to make it to author.php. My permalink structure is
thus the url 'sub.domain.com/authorname' should search for 'author' (?).