The following script can reproduce a potential bug. The script downloads asset history from Yahoo for the symbol "FRE.DE" and then tries to trade it.
The adviseLong functionality then tries to generate a function name with a . in it and therefore the script can not run in test mode.

Code:
// Gives a compiler error when trying to run the script after training
// The problem seems to be the . in the asset name downloaded from Yahoo.
// Zorro tries to generate a C function with a . in it.
// The asset name "FRE.DE" is a valid Yahoo finance asset name.
// https://finance.yahoo.com/quote/FRE.DE?p=FRE.DE

// Warning 034: No asset data for FRE.DE
// Rules: Test7  2000..2016 (5 cores)
// Train FRE.DE_L -Mar 2010- 53.0%
// Rules stored in Test7_1.c

// Run Test7..
// Walk-Forward Test: Test7 FRE.DE 2000..2016
// Error in 'line 3: 
// syntax error
// < int FRE.DE_L(float* sig) >
// Read Test7_1.c

int run()
{
	set(RULES | TESTNOW);

	BarPeriod = 1440;
	StartDate = 2000;
	TradesPerBar = 2;
	Hedge = 5;
	
	NumWFOCycles = 5;
	NumCores = -1;
	
	assetHistory("FRE.DE", FROM_YAHOO);
	
	while (asset(loop("FRE.DE")))
	{
		vars price = series(priceClose());
		var rsi2 = RSI(price, 2);
		var ma = SMA(price, 50);
		var ratio = price[0] / ma;
		
		LifeTime = 1;
		if (adviseLong(PERCEPTRON, 0, rsi2, ratio) > 55)
			enterLong();
	}
}