I got a big problem when i write /say and the name in the chat i always get up "xxx is not connected" but i have tried to peopel who are online but i get up same thing. whats wrong ?
That's probably an issue associated with lag. Some people have logged out, but still appear ingame towards other players and can be interacted with to a certain extent (having equipment views) and vice-versa.
You can try relogging to see if it fixes your problem, but it's a minor thing... so no worries =)
