Hi, i have this problem with all my arduinos (Uno, Yun, Mega, Devduino, self maed unit...), if i leave open the serial monitor it hangs and does not show new data, it can hang in 15 minutes or one hour, but it will hang.
Someone have the same problem?
i'm using the latest IDE from arduino.cc (the real one) on os x Yosemite
Thanks
Fabrizio