Hi - almost newbie here.
I am running the Workshop 6 script - modified for 4 currencies.
It has been running since 9th November and closed out a couple of trades and then modified CAPITAL = 500 from 10000 to be more appropriate (for me)

Data appeared to load OK
====================================================================
Login 0 FXCM.. at UTC 11-09 14:46
Load AUD/USD prices.. 172845 min
Read Workshop6.par
Load EUR/USD prices.. 172635 min
Load GBP/USD prices.. 172935 min
Load USD/JPY prices.. 172605 min
V 1.886 on Fri 18-11-09 14:47:44

Trade: Workshop6 2018-11-09
Read Workshop6.fac
Lookback period (2000 bars)
[809: Fri 18-07-13 05:00] (0.741550).
====================================================================
But have following [Mon 18-11-12 14:00] 731 +7.97 +0.0367 / (0.721690)
[Mon 18-11-12 15:00] 729 +7.97 -1.67 / (0.720790)
[Mon 18-11-12 16:00] 725 +7.97 -6.01 \ (0.720170)
[Mon 18-11-12 17:00] 725 +7.97 -5.69 \ (0.719930)
[AUD/USD:CNTR:L] Skipped (Amount = 0)
[AUD/USD:CNTR:L] Skipped (Lots 0)
====================================================================
still running with 2 trades each with 0.01 lots
The initial profit of 220+ (ish) was before I changed the CAPITAL figure (had 2 trades at 23 & 16 x micro-lots respectively)
====================================================================
while(asset(loop("AUD/USD","EUR/USD","GBP/USD","USD/JPY")))
//while(asset(loop("EUR/USD")))
while(algo(loop("TRND","CNTR")))
{
// don't reinvest
//Margin = 0.5 * OptimalF * Capital;

// reinvest the square root of the component profit
Margin = 0.8 * OptimalF * Capital * sqrt(1 + ProfitClosed/Capital); // increased from 0.5
====================================================================

I have been developing EA in MT4 and used to understanding what is happening i.e. look at chart and see CROSSOVER for example.
Any help appreciated

You can see it in the log: Lots is 0 and thus no trade performed.

If you don't see in your script why lots is 0, print out Margin, OptimalF, and the other values that lead to a zero trade size. There's probably a 0 somewhere.

Thanks for the response.

I see the following in the log
========================================================
Portfolio analysis OptF ProF Win/Loss Result

AUD/USD avg .000 ---- 0/0 +0 ********presumably this is why zero lots
EUR/USD avg .026 ---- 0/0 +0
GBP/USD avg .020 ++++ 1/0 +8
USD/JPY avg .018 ---- 0/0 +0
========================================================

No idea why or where this has been calculated and not aware of having done anything different for this currency
Seem to have History files for AUD/USD (t6's) 2004 to 2018
Will keep on trying to make sense of the available information