The trouble with charging to deliver news via a mobile app is that subscribers get angry when the technology doesn’t work. That seems to be the case for many users of the New York Times’ iPad app, which was updated Friday. Many users complain in App Store reviews that the app now crashes while loading. More than three-quarters of the current ratings are one star out of five. (When I used the app on an iPad 2, the app loaded successfully, but only after an extensive wait.) || Related: New market research shows that more than 40 percent of iPad owners have read a newspaper or magazine on the device. It also finds that women are 52 percent more likely than men to own an e-reader and men are 24 percent more likely than women to own a tablet.