This is actually a message to Admin. I know of a friend who previously was able to sign on to the site and make posts. Due to laptop problems he lost that ability.
He has tried to sign up as a new member but is hit with messages such as -"Error for site owner - invalid domain for site key" "You did not pass the security check - Please try again" - "Your answer to the challenge question was not valid -Please try again".
He has e-mailed Admin. on 3 or 4 occasions and receives an instant computer generated acknowledgment, but nothing thereafter.
He is not a Facebook orTwitter user.
Maybe there are others in the same boat?