Many sequential days have exactly the same OHLC historical rel="nofollow">http://finance.yahoo.com/q/hp?s=^NDX+Historical+Pr... ......... Check it out. Sometimes there are as many as 5 days in a row that have the same values. Sometimes only two days, but that's not an improvement.

Nobody except Yahoo knows why, so don't anybody else even try answering. Just fix it, Yahoo, and quit breaking everything you get near.

It's hard to soar like an eagle when you get your stock data from turkeys. I hear that Yahoo sells real-time data. I feel sorry for anybody who pays for that. :>(