With the IDE 1.6.7 and 1.6.9 the Arduino Micros that i program do no longer appear in /dev after OS X startup. They only appear after unplugging and plugging them in again. This is very cumbersome and makes some applications impossible.
With the older IDE 1.5.8 this used to work fine. Luckily I figured that out after lots of hair pulling! Has the
USB code that goes into the sketches changed? I don't know exactly when this bug has appeared, I can
only say somewhere between 1.5.8 and 1.6.7...