You are never the "Server" when you open a "Room" always an "Client" this is what I have understand so far reading all!
Seems that we have still an "Refreshing" problem
Theory:
You save a "Build" to servers and it just simply overwrites it when you load it again in the " WE" with an difference of 0.0001 in X,Y,Z
Sooner or later you will not be able to load a room!
Cuz they are duplicated then..not much..not visible but enough to freak out this "Engine" having the same probs next to each other!