It’s risky to make a film with only three characters. If the audience dislikes even one of them, that’s 33 percent of the ensemble gone. In the case of “Yeast,” a three-person mumblecore debacle by Mary Bronstein, I hate all three of them. How am I supposed to enjoy a film when I dislike 100 percent of the characters?

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Grade: D

Not rated, probably R for abundant harsh profanity, brief partial nudity

1 hr., 18 min.