I love McDonalds Fruit n Yogert Parfaits, and I bought some Dannon's plain yogert and strawberries to make my own. The first batch of yogert I bought tasted sour, I figured it had expired, so I bought some that is not due to expire until the end of August. It still tastes sour. It tastes like sour cream. Yuck! I cannot taste the stuff without gagging. I'm so disapointed, and puzzled, too. What kind of yogert are they using???