the construction script only fires when an actor is first generated, it will not fire again unless it is re-added or altered. Additionally, if the objects it is looking for are spawning after begin play, it will not run the script. Typically, it is best to use construction script for objects that need code to happen as soon as they are placed or moved in the level or need to be procedurally generated. The gamemode in particular only gets use out of the construction script when you first open the game, so in most cases it is best to use nodes in the event graph or specific actor blueprints construction scripts for various features. What are you specifically trying to do?