problems with teensy3.1 + serial on OSX Yosemite (10.10.5)

I

inx

Member
Hi.

i encounter the following problem with a teensy3.1, teensyduino1.27 on a macbook-pro with Yosemite OSX 10.10.5.

running this code:
Code: 
int c = 0;

void setup() {  
  Serial.begin(9600);
}

void loop() {
  Serial.print("count: ");
  Serial.println(c++);
  delay(200);
}


output:
Code: 
count: 68
count: 72
count: 80
count: 84
count: 86
count: 100
count: 112
count: 122
count: 124
count: 130
count: 136

only on random chance there is an update through the serial port.

can anybody reproduce this?
what might be the problem?

thanks for any hints
 
i upgraded to OSX El Capitan (10.11.3) facing the exactly same problem

thanks for any help!
 
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