From the latest at the DFR:

The pick six appears particularly vulnerable to computer manipulation because of the way data is transmitted from many different sources into commingled parimutuel pools. According to mutuel managers at prominent tracks, the information regarding the amounts of pick six wagers is transmitted the instant a wager is placed, but the actual structure of the bet, including the specific horses that are being used, is not transmitted until after the fourth race is run in the pick six sequence.

The data is not transmitted all at once because pick six wagers include so many potential combinations that the size of the computer files could create traffic problems in the sophisticated totalisator network that links tracks across the country and continually updates wagering information. Instead, only the complete information from tickets still "live" after four races is transmitted into the commingled pools before the fifth race.
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This is obscene and totally bogus. Whoever set this system up ought to be indicted for terminal idiocy.

Too much data for transmission? If that's the best excuse they have, we need to fire Autotote and Amtote and bring in someone competant.

Only horseplyers would put up with this kind of nonsense for so many years.