i want to add to this thread. I have several contacts whose messages come through in iMessage, but the moment I open the thread, the message disappears and all I see are old messages (which are always stuck at the same previous date) and it repeatedly does this just for a few *important* contacts! And interestingly, usually when you get a new message the conversation populates to the top of the iMessage thread list, but the contacts will then disappear from my conversations list and be found further down as an old conversation thread and the new message content will have disappeared. I’ve already done everything suggested with restarting, Backups, iMessage delete settings, re-entering the contacts as new contacts. Nothing is working!