Can't see my friends/they can see me.

[Vambda]

It has been actually a while that I got this problem, I have always "0 friends connected", when actually, there are.
I see in the chat "Player connected to the game", but I don't see them in the menu.
They don't see me either.
It might be something I've done with the configuration, but I can't find it. Can you help me please?

PS: I got some problem with the horn too, there might be a relation ( ? ).

[Vambda]

Ok so there is an error in the topic, it's "they can't see me"