Null References for clients on Multiplayer Play Mode

I have a scene, with a script and game object that has references to UI elements ( inputs ). These objects were manually dragged on through the inspector. When using Multiplayer Play Mode, the main editor has the correct references. However, player 2, 3, and 4, will have null references once I press play. No code interacts with these game objects

This screenshot shows the two inspector panels side by side, this is immediately after pressing play.

Am I doing something wrong?

Sometimes MPPM gets out of synch with the main editor. If you close the project, delete the folders inside /Library/VP then try again the issue might go away. If not, close and delete entire /Library.

This resolved the issue in its entirety.
Many Thanks