certainly the problem is from my side, but it is not so easy to found the solution when the cause is unknow;
for example, after a sincronized restarting of 2 Zorro instances running Z12, two MT5 running, the result is that: - in one MT5 the "expert" tab is full of Zorro' complaints; it seems that the orders have 10 digits and the tickets only 9, so Zorro cannot find the entered trades. - In the other MT5 it seems all ok, for now. (ref.annexed)