Username is already in use

why it keep telling my members that username is already in use every time when they try to change their username and I check to see if their user names already existed but none of them were. Can you please tell me why? and how to fix it.

thanks

[Zachery]

Originally Posted by influence

why it keep telling my members that username is already in use every time when they try to change their username and I check to see if their user names already existed but none of them were. Can you please tell me why? and how to fix it.

thanks

Are you running the latest version?