It seems that an issue has been created: Unreal Engine Issues and Bug Tracker (UE-48228) “Instanced Static Mesh components that are part of a Blueprint aren’t visible in Standalone Game” (these are the symptoms of this bug).
It seems that an issue has been created: Unreal Engine Issues and Bug Tracker (UE-48228) “Instanced Static Mesh components that are part of a Blueprint aren’t visible in Standalone Game” (these are the symptoms of this bug).