MT5 Strategy Tester Stops Working for No Apparent Reason -- No Indication Why From Platform

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.  . No change of settings .  . Algo Trading enabled, demo account and live account -- why does the platform give no kind of indication when something is wrong? 
 
If your code stops returning, the tester stops. There is no indication, because your code is still running; it has not performed a fatal error.
 
William Roeder:
If your code stops returning, the tester stops. There is no indication, because your code is still running; it has not performed a fatal error.
It never begins. 
 
There might be multiple instance running at the same time, when one stops running because of an error it's flagged as not responding by the file manager thus no new instance can be created. open the task manager and close all threads of Metatrader. And whatever you are testing has errors.
 
ronald828: It never begins. 
Show your Journal log from the Strategy Tester! There should be something there that might give us a clue.
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