Here's the problem: I have all the other ingredients for this quest, but I can't get the rancid oil. I found a key in the alchemist's lab, it vanished when I picked it up, but I don't think it's in my inventory. If it is supposed to open the cabinet in the lab, it's not working. I've searched everywhere for a locked cabinet (mentioned in the alchemist's note), but can't find one anywhere. I'm hoping my game isn't bugged because I was really enjoying it and starting over would just suck. Please, someone just spell it out and tell me where the locked cabinet is. No cryptic answers, please. I'm really sick of combing through this section of the game... it has consumed too many hours already. Thanks in advance.