MT5 decided not to download data for Strategy Optimiser/Tester



I have been using MT5 Strategy and Optimiser successfully for long periods/times.

Now it has decided not to download the data when I hit the Start for Optimizing an EA.

There has been no changes to the Inputs.

The Broker advice was not helpful, in fact it was downright risky.

There has been no recent Windows Update and I have restarted the Platform.

MT4 Platform is working well as expected.

Thanks and regards