Hi,

Try to change an author from backend by clicking 'Change' button, under 'Author Publishing Option, but failed to do so...it goes to another page with a list of user but when click at user, nothing changes.

Joomla 3.0.1
K2 2.6.1

Got the same issue, we are 3 members to get this issue since we have upgraded to the newest K2
but it seems that K2 is not considering our request :(

There is a post here about this topic somewhere, lets search for it

lmgtfy.com/?q=can%27t+change+author+site%3Agetk2.org

the top link will solve some sites problems with this issue