A patron complains that at a Broadway Theatre recently, audience members were forced to surrender their cameras upon entering the theatre. “At the Bernard B. Jacobs Theatre to catch a preview of Richard Greenberg’s ‘Three Days of Rain,’ starring Julia Roberts and opening officially Wednesday, he and other patrons were ordered — rather rudely, he says — to surrender their cameras before going in or to give up their tickets. Despite years of theatergoing, he says, he’s rarely experienced treatment so brusque.”