I haven’t touched the main theme code in any permanent way but I am using a child theme. I haven’t overridden author.php, though. I have translated part of the theme with Poedit, but I’m pretty sure that shouldn’t have an effect on this in any way, unless there’s a major error in the code.
I’m not using any author plugins.
My theme version is 1.1.4 and WordPress hasn’t suggested an update for it so I think it’s the latest one. I’m using WordPress version 3.6 and I haven’t updated it to 3.6.1 yet because this is a production site and all my plugins haven’t promised 100% compatibility yet.
Link to a part of the site where you can see the problem: http://rubic.fi/blogi/author/prajamaki/