Hi Gerhard,
That is strange. I don’t use mt5 much but presumably you have your auto trading activated?
If it’s not making trades then keep an eye on the error messages in the expert tab to find out why?
There will be a reason why it’s not making trades, but only apply it to the timeframe and symbol it was developed on.
changing the timeframe and symbol will not resolve the issue of it not trading. Showing some screenshots might help