Checking further 'under the covers' I notice that TwinSpires is reporting 21 horses in its tote stream. It is possible the RDSS code did not allow for more than 20 horses and does not fail gracefully enough when encountering that.
I do note that the above mentioned Tote_enabled=0 solution seems to resurrect the Derby Race 12 for analysis, at least on several computers I checked running V2.1.049.11
Ted
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RDSS - Racing Decision Support System™
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