After having applied the patch I've found that my summoning doll is no longer in my inventory. Worse, when I encounter the Demon Asmodeus I can no longer collect the doll he leaves... this leaves quite a hole in the plot.
Before the patch: I had solved the mushroom spore quest but the cure remains in my inventory and the quest remains uncompleted in the diary... if I try to discard the potion the quest comes back. I've checked the forest and the imps are definately gone (cured one presumes).