Different historical data in Bulid 200 vs. 198?
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After having updated my MT4 to Build 200 (I trade with FXDD), I found that the the historical data were changed. I did some statistics comparing the 198 data base I had saved on my PC and the 200 data base, and here is a sample of results: for LOW 1HR GBPUSD prices , the absolute discrepancies are up to 62 p. in 2006 (mean = 1.8, SD = 3.2), up to 127 p. in 2005 (mean = 2.0, SD = 4.2), and up to 214 p. in 2004 (mean = 12.1, SD = 15.5)!!!
Or compare two versions of 1 hour USDJPY data:
198:
20040101,000000,107.23,107.33,107.20,107.30,13
20040101,010000,107.22,107.33,107.20,107.30,10
20040101,020000,107.22,107.33,107.20,107.30,14
20040101,030000,107.22,107.33,107.20,107.30,14
20040101,040000,107.22,107.33,107.20,107.30,12
20040101,050000,107.22,107.33,107.20,107.30,12
200:
20040101,000000,107.24,107.25,107.21,107.21,5
20040101,010000,107.31,107.31,107.21,107.21,2
20040101,030000,107.31,107.31,107.31,107.31,1
20040101,050000,107.23,107.31,107.23,107.31,10
Not only that some hours are missing in the new build data, but the data for the same hours are different.
Needeless to say, my trading strategy backtesting behaves quite differently with these two versions.
FXDD failed meanwhile to address my query.
Do you have a hint, what might have happened here? Thanks in advance...