Alright, here's a list of bugs going on right now, as of 1.2.12785.
Multiple types of enemies do not seem to spawn as often as they should, or at all. Chaos/Spectre Elementals, Moth, Shadow Mummy, Lost Girl/Nymph, All Pigrons, Snow Flinx, Undead Viking, Armored Viking, Jungle Creeper, Blood...