So I was watching a batch of Mothzarella finish. It was at 99% from straight curd. This was stage one so curd in tray in mine. It went 99% to Generic Gouda. I then went to my cellar where I had started some Cellar Cheddar on a minor delay. It too went 99% Generic Gouda. So that was 6 racks wasted. But then I remembered my last batch had gone to gouda as well. I thought maybe I had just mistimed it from the wiki but I double checked just before posting this and the wiki says it takes 2 days to fail. My last batch was 3 racks of Cellar Cheddar as well and it went to generic gouda within 2 hours of when it should have turned into cheddar.
Edit: Bottom of wiki says cellar cheddar is broken in W7 but I have bought/found Midnight Blue Cheese this world so I know it has to be craftable.