Same Kit, Drastically Different Result

[crbrown25]

an Irish Stout kit last year with the following ingredients. Turned out great...silky smooth, great molasses taste, great color and mouthfeel...a very nice dry stout. I brewed the exact kit again a few mons ago. This time, however, it tastes like garbage, has the color of a brown ale and the mouthfeel of a diet coke. What did i do so differently from one batch to the next to cause these changes? The only thing i can think of is a few degree difference in the fermentation temp. Any other ideas?

6.6 lb. Coopers Light Malt Extract
¾ lb. M & F Roasted Barley Malt 675° L
¼ lb. Briess Crystal Malt 20° L
1 oz. Phoenix (Bittering)
Wyeast # 1084XL Irish Ale Yeast

 

[Flyingcow]

I had that happen to me a while back with an extract kit. For me it was a nasty bacterial infection in my fermenter. I'm not sure it was the only problem, but once I fixed that, I didn't have the problem again.