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MT4 Build 600 Bug report: MT4 will not initialize more EA instance when restart

The scenario is: There are two or more EURUSD charts opened with a same EA, which EA need some variable initialized in the init(); If I load the EA with set1 on EURUSD chart 1, then load the EA with set2 on EURUSD chart 2, there is no problem . The same EA worked on the both charts . But if I closed

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