It has nothing to do with MQL5 or the tester. Your reinstallation did nothing. It is your code; fix your broken code.
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HI !
I have re-installed MQL5 but is not working correctly.
When I use the Strategy Tester, and run the optimization , the graph (tab) just shows a straight line. The optimization results(tab) shows Profit - 0, Trades -number, eg, 200. The Back -Test shows 0 results
It is the latest Ver. 5,00. Build 2962.
*NB : I re-installed windows 10.