Mega777

Use your cursor tool to determine the exact date and time of the huge spike bar. I found mine was 2020.03.23 10:44. From the file menu at top, navigate to Tools - History centre - Then find the mkt you're having the problem with eg EURUSD is under S-Forex-1-GBP so click on S-Forex-1-GBP, then navigate down to EURUSD(£), then click on to highlight 1Minute (M1). After the right side window populates with data (may take some time but WAIT), then scroll down to the Date and Time that you'd noted before (2020.03.23 10:44 in my case). Check to see whether the OHLC data appears to be 'corrupted' ie the values SHOULD be similar to those minutes before and after. Click on that data line to select it and then click 'edit' below. A window will pop up (eventually). Mine had the decimal point for the High in the wrong place and the close value was also a bit too high. After correcting the decimal point and adjusting the value of the Close to the same as the Low, click 'OK' then wait for the window to close and close all windows. Your chart should have 'normalised'. However, all of this was due to corrupted and 'missing' data (there was no data from Fridays (20th) close till ~10:15 Monday (23rd) morning). Therefore, there will always be a 'gap' in your data and therefore in your charts which you should bear in mind when backtesting etc. I don't have MT4 'live' account so don't know whether the 'live' data was similarly affected but suspect it would have been reported and fixed relatively quickly, if not immediately, whereas demo account data is not so important (to IG). If you have a live MT4 account or know anyone that has and is willing to spend the time to help you, they can follow the above steps until 'edit' and select 'Export' instead. A 'csv' data file is created which can then be sent to you and imported to your platform using the 'Import' selection. Hope this helps.