( August 2, 2012) -- It didn’t take long for fissures to begin developing in what had been shaping up as the largest settlement of a private antitrust case in the history of the Sherman Act—a proposed $7.25 billion deal that would end protracted litigation between a class of about eight million U.S. merchants on the one side, and Visa Inc., and MasterCard Inc., and the banks that issue their credit cards on the other....