It seems that something is wrong with history data or LookBack function after updating from 1.441 to 1.46 version.
I tried this code

function run()
{
LookBack=1000;
BarPeriod=240;
StartDate=20140101;
asset("EUR/USD");
}

I got repeated messages: "Warning 030 - lookback reduced (1000 -> 833)".