Please provide sufficient information about your settings and the log entries...
I get the same issue.
Strategy tester was working fine then stopped working.
The only complaint in the journal section is "connection closed."
I seen this issue happening sometimes when tester agents being stucks for some reasons.
Instead of reinstalling MT5, I suggest to restart your pc.
Also, try to start visual mode or to backrest different EAs.
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Тестер стратегий MetaTrader 5: ошибки, баги, предложения по улучшению работы
fxsaber, 2025.05.15 09:21
It can be treated by deleting the corresponding metatester64.exe process.

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Hi, today when I opened mt5 strategy tester I am getting an error, while it was working fine when I turned off my pc last night. When trying to backtest I get the message "connection closed" on core 1. I have tried to install a new mt5 terminal but I get the same error message. Does anyone know what is causing this and how to solve it?