So, I have no idea what's happening, but I added this mod and now, absolutely no enemies are spawning whatsoever, even with spawn rate set to THIRTY TIMES (Cheat Sheet), and there is this recurring problem where if I use the last item in a stack with my inventory open, my selected item becomes stuck on the empty slot. I am unable to interact with any items whatsoever except more of the last item I used (ex: Recall Potion. used one, couldn't do anything but pick up more Recall Potions) and once I've picked up another of whatever item, I can't put it down. Leaving and rejoining the world fixes this, but it's happened twice within ten minutes.
EDIT: Oh, also, the Guide died, and when the message that he had respawned appeared in the chat, he didn't actually respawn anywhere.
Further NPC testing with Cheat Sheet: nothing spawns whatsoever. Tried spam-clicking several town NPCs, nothing. Eye of Cthulhu, nothing. Skeletron, saw the arms (but no hands or head) flicker into existence for a frame or so, then gone. What the hell.