First off, you need not be so literal when following my tutorial... you say you want to spawn "DoomBox" on layer "Main," but you have no Doombas and you have no "Main" layer
. Why not call the hitbox for your droid "droidBox?" And you should tell the droids to spawn on, say, your "action" layer.
That problem aside, I think the issue is that instead of just creating an event sheet to control your droids, you created a whole new blank layout and used that event sheet instead. I think there's some conflict with that blank layout.
Delete the layout and event sheet, and start from scratch with a fresh sheet that's not attached to a layout. Hopefully that will fix it.