[quote=zupcon]
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Originally Posted by Diam0nd
The way data is modelled was not changed in 200. You can find the list of changes here: http://www.metaquotes.net/newsQUOTE]
The way data is modelled / interpolated has changed according to point 4 of metaquotes news release which states
4. Tester: Imrpoved fractal modeling of a bar. Now more smoothed patterns are used to model price movements
As to the quality of the data, it should be easy enough to scan for missing bars, or do compare for differences with previous data. Its also probably worth backtesting strategies by hand at least once, and comparing this with the output from strategy tester. You get to see if the testers working as you'd expect it to , with the added bonus of looking at some charts 
regards
zup |
If you backtest EA using alpari data (every tick) and some other data (with 90% for example) so you will have diffrent results in most of cases. Bcause of the different data. Especially for aplari/nf/fibo group and ibfx. And the results may be completely different.
I install 200 version of MetaTrader now and this version is having possibility to downlod the data for backtesting. But I am still not sure: I am downloading M1 data for my broker (which I need), or from some banks or any (which I don't need)
Just for example: if you are using North Finance so it is better backtest your EA with North Finance data. And if the settings of some EA was optimized using Alpari data and you find it profitale by backtesting so this settings will not work with IBFX broker (Will work but losing money).
What is wrong with different data? Nothing wrong but sometimes EAs are having very different settings because of different broker's data. And sometimes even different systems because of that. And I know some systems which will not work well with IBFX data and will work for Alpari data much more longer.
So, probable it is different data.