In that combination, I feel the meaty hand of the producer Garth H. Drabinsky, who seems to have used his influence to shape “Paradise Square” into a likeness of his previous hits. Like “Ragtime” in 1998 and the 1994 revival of “Show Boat,” it frames social unrest as the product of a few representative individuals and tries to fill the inevitable gaps with big sound and stagecraft. It also borrows a famous plot device from “Show Boat” — which is effective here even if the debt goes otherwise unpaid. But unlike those musicals, which were built on the frames of strongly written novels by authors with singular voices, “Paradise Square” feels almost authorless despite its many contributors, and the direction of Moisés Kaufman, known for a strong hand and conceptual coherence, does little to erase the impression of anonymity. (The design elements are likewise merely efficient.) Contingent and anxious, the show seems more interested in saying the right things than in telling a coherent story.