Something Aint Right

Three weeks ago I decided to make a yeast starter from one of Rogue's famous beers. They use a special strain of yeast known as Pacman yeast which is supposed to be very clean, and have a very high attenuation (80%-85%). Unfortunately due to scheduling conflicts I was unable to brew and had to put the starter aside. So I let it sit in the fridge for a few weeks, giving the yeast a nice rest. Today was the day to have at it and use the Pacman on the oatmeal stout I was to make. But when I opened the starter to take a whiff... phew! It smelled like sour milk. Definitely not something I want to put in my beer. So, I'll be putting off the stout once more and taking another go at building a starter from harvested yeast.