ACTION_WaitAndTrigger (visible in the scripted sequence dropdown as "Wait Then Trigger") was prematurely included in the recent update for Halloween, and has been known to cause problems when saving and loading games when playing maps that include it. This action has been stubbed out for the next update, but in the meantime if any of your custom maps use this action, you will want to replace it with ACTION_WaitForTimer and ACTION_TriggerEvent. We apologize for the problem.