Messages is great, but is there a way to get every iMessage duplicated across iPhone / Mac? Otherwise you send an iMessage, close the mac, grap the iPhone and go away, but never get the reply back. And so forth.
At least 2 weeks ago I also was not seeing that behaivor. I had to unpaid my iPad because I was missing vital messages on my iPhone. Its possible that my iPhone was out of service at the time. But that shouldnt matternn