In a Connect Chat conversation, if you have scrolled up to read a previous message and a new message is received, the windows does not automatically scroll back down to show the new message. Instead you must manually scroll down to see that a new message has been received.
This is Expected behavior.
If the user has manually scrolled up to read a message and we constantly scroll away from that message that they are trying to read because of new messages, it would be a very bad user experience. The user will need to scroll back down to view new messages.