Another similar problem - I get the same error when trying to backtest two years of data for a symbol if the sum of file sizes is cca 500 MB+.

Minimal example for FXCM data:

Code:
function run()
{
	History = ".t1";
	StartDate = 2014;
	EndDate = 2015;
	while(asset(loop("EUR/USD"))){}
}


Again - trying in VirtualBox with Win7 64bit and 12+ GB RAM.