A friend has an Apple phone. When he sends me a message in Facebook Chat, I can see it. If I reply to his message, or if I send him a message, he can not see it. It doesn't matter if we are across town from each other, or sitting in the same room. This just started a couple of days ago. Each of us has no problem sending, receiving, or replying to anyone else, wherever they may be. Any ideas what the problem is here ?