Sorry - very vague error description if any
So makes it somewhat hard to help precisely.
Do you on instantiation on the creator client send a message to the other clients to instantiate a new object?
Do the client receive the data about the new block? On a network layer? As an instantiation of a remote avatar/ghost? Missing to link a prefab in?
Is the remote block in the scene tree but not rendering?
Errors on the console? In the player/editor log?
Phew - just a few questions to get you going
Sorry. I'll answer each specifically so you might get a better idea of my problem.
No, I do not send a message to the other clients to instantiate the new object.
I have no idea if they recieve data about it.
I have no console errors.
My blocks render, but the others do not; clearly because the scene is not recieving data from the other end and vice versa.
From what I can see my issue is the first one; do you have any idea how I would get it to send a particular message? Would it simply be a SendMessage to the other client with an instantiate function and it's appropriate arguments, or something far more complicated?