newdigital, thank you for you lengthy response.

What this must mean is that the Backtester simply does not work properly when using 'current prices' to enter trades, particularily for scalping strategies. I spend quite a lot of time coding and have been able to detect no errors with Metatrader while in visual mode when opening trades before the current bar closes. I also have checked and it seems to handle High/Low of the current bar correctly.

Also, one could argue that scalping at the close of bar is doomed to failure as you are working with 'old' prices - even on M1 charts 60 seconds could be viewed as 'ancient' prices when you're looking for 5-10 pips!

Please don't think I am disagreeing with you - I am not! There is something definitely 'wrong' with Metatrader, I just have not been able to find out what it is.......