Hi there We noticed that after building the game (Atleast, we think that's what causes it!) some object references become 'Missing'. When I find the object in sourcecontrol, I can see that it has been reserialized and all the FileID's have changed within that prefab. If I discard these 'changes', whoever was referencing it goes from showing 'Missing' to not missing anymore. I am having trouble reproducing it. It also only happens on a few fields on certain objects. Always the same field and always the same object. Its really strange.