Why some messages sent using Facebook Messenger arenít delivered?
At Facebook Messenger for IOS my messages to some friends (doesnít happen to all, what is even odder!) are showing the sent symbol (the blue circle with a check mark), that NEVER is replaced by the indication of delivered message (the circle with blue fill with a mark of check). Therefore, I am always in doubt whether they have received them or not, whether they have read it or not, etc ...
Then, I end up confirming that, some of the messages they receive, some not!
However, the symbol never changes, always keeping the indication of ďmessage sentĒ until receiving a reply. And then, when I send a new message, everything is repeated over and over and over.
And, when i check those messages in Facebook, also I don't get the "Viewed at..." message information. It's like if the message is lost between the send act and the receiving act...