Therealisa is right. The problem is that each console is capable of displaying anything that appears on the main viewer, so the moment a custom generic object is spawned anywhere in the game every console searches its Missions folder and loads the mesh and its skin into memory. If a console doesn't find the mesh or skin file it will crash immediately.
I've discussed this with Thom and he agrees that it is a flaw in the Artemis program. Some future version of Artemis will allow the server to share its mesh and skin files with all of the consoles over the network. When this happens only the server will need a copy of the mission folders.
But for now, most missions do not use custom generic meshes, so they will work fine without copying the mission script to all of the consoles.
"Damn the torpedoes! Four bells, Captain Drayton!"
(Likely actual words of Admiral David Farragut, USN, at the battle of Mobile Bay. Four bells was the signal for the engine room to make full steam ahead).