I upgraded WP (mu) from 2.6.5 to 2.8.4 ; Since then, I cannot change the post author when logged as admin: the dropdown menu isn't displayed.
When logged as a user with posting rights, I get back the drop down menu with availables users.
In other words:
As long as I used version 2.6.5, I could assign a post from admin session to any other user. Since 2.8.4, I cannot anymore, the option in the "post" page isn't available.
However, admin user can still post, and is then the author (which is not what I want: I used to create a post from within admin account, then assign to the correct user).
Thanks for yout suggestions?