Pro Micro conflict with timers and serial.print

i trying own version of luc small's weather station decoder working on chinese arduino micro pro (5v). have working fine on uno r3. have adapted code micro pro, changing ports, , have working sort of. works in picking weather station transmissions , decoding them, problem have printing serial monitor, prints first 63 characters each transmission , cuts off mid word.

{"petes_weather_station_status":"started"}
{"sensor_id":"a4e", "humidity":82, "temperature":10.9, "wind_sp

a normal transmission this:
{"sensor_id":"a4e", "humidity":83, "temperature":11.0, "wind_speed":0.0, "wind_speed_max":0.0, "wind_dir":0.0, "rain_sum":506.4, "validity":1, "full_message":"a4 e1 fe 53 0 0 6 98 0 c8 "}↵

it keeps receiving packages, , keeps printing first 63 characters of each serial transmission.

my full code here: https://www.dropbox.com/s/aeblbo71r95bio5/betterwh2_pg_v20_promicro.ino?dl=0

i have tried whole heap of troubleshooting, , believe have narrowed problem down sort of conflict between timer , serial output. code below simple test of timer set , try print text serial monitor. "serial started" text comes through, the  pro micro freezes , onboard leds turn on solid.

if comment out timsk1 |= (1 << ocie1a); line, code works fine, , text comes through on serial monitor expected.

can shed light on why wouldn't work?


#define counter_rate 1600

void setup() {

  serial.begin(9600);
  while (!serial) ;  // while serial stream not open, nothing:
  serial.println("serial started");
 
  nointerrupts();           // disable interrupts
  tccr1a = 0;
  tccr1b = 0;
  tccr1c = 0;
  tcnt1  = 0;

  ocr1a = counter_rate;     // compare match register
  tccr1b |= (1 << wgm12);   // ctc mode
  tccr1b |= (1 << cs10);    // 256 prescaler
  timsk1 |= (1 << ocie1a);  // enable timer compare interrupt0
 
  interrupts();  // enable interrupts

}

void loop() {
      serial.print("i want print text out serial monitor");
      delay(10000);
}

when try follow link, get:

quote

the proxy server refusing connections

now, know problem on end (my company's proxy server 1 refusing connection). but, if followed rules, , attached code here, see it.

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