I'm having a relatively large issue with the creation kit. Whenever I ever try to place an Actor (enemy) in the dungeon I'm creating, they will never spawn! I tried playing around with idle markers and other stuff thinking that might fix it, but nothing I do works. The actors I place always appear in the Creation Kit, but never in-game. Help me? Anyone?

I tried making a fresh ESP and adding NPCs there and nothing still worked. Do I have to do something other than drag the Actors I want from the Object window into the Render window for them to appear? Because it seems like nothing I do is working!