Some disappear and get never sent out!
This is really awfull. I've sent a lot of messages for which I never got a response. When I look into the sent message list, the message is gone!
This happens only when a new message is sent, not when replying.
It is really stupid, that it is necessary to scroll down and hit 'send' a 2nd time for no reason. Also, I can't see that the message did not sent off until I scroll down!!!