I am experiencing this weird thing that heralds are not spawning at all in my single player campaing. I have terrorize whole acts, almost full cleared the zones with /players 8 and none are spawning. Last time when I played (last Thu or Fri), I could spawn them at regular rate. Is it just me or is there some sort of bug in the SP herald spawn rates? I am using the same map layot (=not switching difficulties between creating games) so perhaps this might affect this?