Also, there seems to be some “session” (or whatever) stability issues.
What I mean is that I’ve noticed that sometimes it seems people don’t receive my messages and neither do I receive theirs. After a while I found out that I have to go to the “account” options section and tap the “online” switch back and forth a couple of times, let it work on it for a few seconds, and then it turns green and suddenly my messages start going and coming.
I also made a “clone” account to test this and many times, supposedly both of the accounts being online, I message or call one from the other, and it doesn’t go through, until I do that same “procedure” again, and THEN it works…