I cultured some wild yeast a while back but I haven't used it for awhile until now. I used it in a new batch. I used two half-full bottles of the old beer I had under the counter and a bottle of dregs I was keeping in the fridge, they are about 2 or 3 months old.
It started just really going today and I smell a lot of really strange smells comming from the airlock, they are not what I remember from using it, but it's been awhile. Could the yeast have mutated or is it more likely that is the yeast acting differently from a different wort?