So after finding the big key I kept playing for a while, and before I fought the boss I saved and quit because I had to go somewhere. I get back on the game only to find that when I come to the boss door, it won't open for me. Thinking perhaps I just no longer had the key, I returned to the room where I found it and the chest is still there empty. However, on the mini map, it still shows it as a gold chest. Is this some sort of glitch? Has anyone else encountered this problem that knows how to fix it? Any help would be appreciated as this is very frustrating. Thanks.