I’m running OSX 10.9.3 and my Arduino IDE can no longer see the serial port for my board (an R3 Uno). I have downloaded the latest FTDI USB serial driver (10.4…) and tried both the 1.0.5 and 1.5.6-r2 IDEs with no success. I used to have this working, but I can’t remember if that was before 10.9.3 or not.
I should have mentioned that I tried this to disable Apple's new FTDI drivers: http://stevenbreuls.com/2014/03/fix-ftdi-dmx-interface-arduino-on-osx-10-9-mavericks/
I am also seeing some posts about running something called macosx_setup.command, but it's not in the Arduino download AFAIK.
It was the cable.
Please kill me now.