Ch340G program main sketch not start load problem

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i have few arduino nano ch340g , few other boards using ch340g. works fine, there glitch. whenever these boards plugged in computer arduino ide opened, main program not start. instead flashes led 13 repeatedly. program inside board start 1, after uploaded sketch using ide; or 2, after closed arduino ide; or 3, after open serial monitor.

i have dug deeper it, , found out (at least ch340g) whenever arduino ide (1.6.8) opened, send out serial data out every second automatically itself.

that's bug in 1.6.8.  use 1.6.5r5 or 1.6.9

not specific ch340g - broke serial handling windows in version. continually pokes serial port causing twiddle dtr , reset board.


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