I’m getting an error 401 when I call GET statuses/user_timeline for an invalid (suspended) user. I just switched to application authentication, and since error 401 is invalid credentials I thought I had done something wrong. But all other queries seem to work OK, so I think it is because of an invalid screen name in the call. I appreciate this use case is not high priority, but you might want to check to make sure the root cause isn’t causing more dire problems elsewhere…