In the latest Late Nite Catechism installment, the nun known only as Sister teaches a seminar on morality in film. While based on the same archaic Catholic-school experience as its forerunners, this work is the first that feels dated. It dwells on the most obvious nostalgia (Spencer Tracy as Father Flanagan in Boys Town, The Sound of Music) and breezes past anything current or controversial (save for a nod to The Sixth Sense and a recycled Da Vinci Code bit). Also, while Elaine Carlson's Sister commands respect, she doesn't inspire the fear-of-the-ruler adrenaline rush that, for my money, was always half the fun. Whether it comes in the form of more provocative content or greater sisterly spunk, this production needs more salt in the holy water. --Kim Wilson Buck a Open run: Sun 3 PM, Royal George Theatre Center, 1641 N. Halsted, 312-988-9000, $30.