Dow Jones Indexes sees glitch-free Dow calculation | Reuters

Dow Jones Indexes sees glitch-free Dow calculation | Reuters: "With an hour left to trade, the Dow Jones industrial average fell more than 500 points as it abruptly added about 200 points to its slide in late afternoon trade on Tuesday.According to Dow Jones Indexes, 'unusually heavy volume' caused a 70-minute lag in correctly calculating the value of the Dow and the subsequent downward spike in