Jeffrey Katzenberg says the launch of Quibi, hisnew short-video service, hasn’t gone to plan. The company has recorded 3.5 million downloads since its launch a month ago, and of that, 1.3 million are “active users”—figures that Katzenberg said were a disappointment. Those numbers are well short of its internal projections of reaching more than 7 million subscribers with a year of Quibi’s launch....