I recently bought ARDUINO MKR1000 WIFI board. The board works fine when I load a sketch and starts running the program and displays the data strings on the Serial Monitor. The issue is when I reset the board I do not see any debug messages on the serial port. Everytime if I had to run the program I have upload the sketch. The example I am using for this is SimpleWifiWebServer from the wifi101 library.
But the reset of the board work for a simple blink project, even when I reset the board the LED start blinking.
You should try by closing the serial monitor before reset.
After reset, reopen the serial monitor to get the data on serial monitor.
You need to post the sketch that does not work but please use code tags to do so ( </> ).
mentioned above you'll have to close and re-open the serial monitor as the board uses Native USB for the Serial when reset the port is disconnected from the PC.