I also do it the same way as you do almost daily and never experienced that - the backtesting results prior to the last month you´ve just enabled never change here. There must be something else that you are doing "wrong". Can you make a quick screen recording video of this issue? Then we can surely help very quickly with this.

That´s what I thought. The trades prior to the previous backtest can ONLY change if you also mess with the start date. And the simple solution: if your strategies go from positive to negative just by changing the start date, they are no good as this means they are depending on the trading chain. To be honest, this is a typical beginners mistake. Any strategy that fails a change of the "starting bar/date" and turns it from positive to negative, needs to go to the bin right away, they are not stable enough in this case because of that trade chain dependency.

There is actually even a Monte Carlo test to eliminate strategies with exactly that problem (every good trading strategy generator offers that) and it´s called "Randomize backtest starting bar". So you should use this feature (I do too especially if generating strategies on just 11 months of data) and such strategies will automatically be discarded, leaving you with only the ones that are stable enough to survive a change of the start date.

Oh and if you are frustrated already by now, you can as well stop trading Forex, to be very HONEST. It took me ~5 years of daily work on trying to create profitable automated strategies. And once you have those, you will face broker and market manipulations, slippage, all kind of funny stuff that will again make them unprofitable. It´s just an honest advice, this is no market you will make a "quick buck" in with just little efforts, only if you see this as a real business you can really succeed, and even then it´s incredibly hard. If you don´t believe me, you´ve most likely heard that EU brokers need to publish the profitability of their users because of new EU rules. Just look at a few EU brokers you find on Google and go to the front page - the profitability of their users must be displayed at the bottom of their main frontpage. There you will see that the 73% to 90% of the traders their lose money! And this does not mean that the rest is profitable because most of them are breaking even or hovering above/below the 0 profit/loss line most of the time. What I am really trying to say: don´t waste your time if you don´t want to put hard work and I mean REALLY hard work into this and have nerves of steel ;-)

If you still want to continue, I am happy to help with further questions. :-)

Thanks for the reply!

Even if I change ONLY the finish date of the back test the strategy completely changes all entry and exits it should not do this. I understand what your saying about changing the start date but the finish date should t have this effect.

Don’t worry I know it’s not easy! I put in hours every day even working a 50+ hour week. There’s no easy buck to made trust me I know that all to well.

The thing I’m getting frustrated with is this is clearly a bug which throws you back to square one and without finding out why or how you have no confidence in generating new strategy’s to begin with.

Once I get in front a computer I’ll post up some more info with screen shots

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