We keep getting a very unpleasant sulphurous odor - to me it smells exactly like driving past a paper mill - that seems to be coming from our woodstove. I kept thinking it was a dead mouse somewhere but it only seems to occur when the stove is burning. Also ruling out the dead mouse theory is that it has been going on for two months and hasn't gotten any better. It's not all the time while the stove is burning though... it comes and goes. But it's never present when the stove is not lit. It's driving me crazy... any ideas??