Autotrading must be enabled or else some MT4 function will crash at EA start. You must then remove the EA, enable autotrading, and put it on the chart again. - For letting two Zorros run the same strategy, give the "Script" string two different names. You can do that with a define from the command line without changing the script. But with the Z strategies this is not possible - you must then really have two Zorro folders.