It seems to be when going direct to a user profiles via ID or usernameServer Error
404 - File or directory not found.
The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.
eg. https://adultwork.com/16039 or https://www.adultwork.com/Webmaster
Via this (https://www.adultwork.com/ViewProfile.asp?UserID=16039) sort of link still works.