At the first I thought this is my problem that I don't see the green square of players on the map, till I saw a guy who was confused and was asking me about this problem if this his PC's problem. And then noticed about a few other people who had the same problem. Yeah that's the problem, players icons are invisible on the map till they enter a group then the blue iconcs are visible. But still don't know, if I'm wrong and this is only my problem, let me know.