I found that this is happening to many people... When a player has played/talked (idk witch 1) they seem to get a message saying Message couldn't be sent Idk what this is so I wonder if you could sort this

Sounds weird. Screenshots would help get the troubleshooting started.

Okay personally I have never had it happen to me but a friend of mine (miccol9) did have it once he told me over skype

http://i.imgur.com/3I1ZpP4.png If this is the message you're talking about, then your friend has disabled chat in his settings. Tell your friend to go to Options --> Multiplayer settings and make sure it says "Chat: Shown".

Yes but for some odd reason he said he had never clicked that to be honest idk if he even know's how to