I’m using version 2.7.1 with the Thesis theme 1.5 – sometimes the option is there and sometimes it isn’t. Unfortunately, when the option is not there, I open the Screen Options menu (upper right of the Post Edit screen) to turn it on, and the Post Author check box isn’t there either, so there’s no way to turn it on.
The only “fix” I’ve found is to keep trying. Eventually it mysteriously appears and I can change the author.
I looked in the Main Index file, and my author code was commented out. It looked like this:
<!– by <?php the_author() ?> –>
It should look like this:
by <?php the_author() ?>
When I removed the <!– from the beginning and the –> from the end, it worked.
