HTC tumbles again; growth potential in doubt Stock Market PredictionsTAIPEI (Global Markets) - Unnerved by a second profit warning in a month, investors sent HTC Corp shares tumbling for a second straight day on Friday on concern the world's No.4 smartphone maker may be running out of ideas in an increasingly competitive market. The popularity of Apple iPhones and Samsung Electronics' Galaxy line-up, coupled with recession-weary shoppers and long-running lawsuits, have taken the gloss off what was one of the industry's biggest success stories.With...