Apple recently decided to make their own FTDI driver with the release of OSX 10.9 Mavericks. This broke compatibility with Arduino & USB DMX interfaces based on a FTDI chip. Here is how to disable the new driver and use the old FTDI driver. All your apps will be working again like they should.
Compatible with OSX Mavericks 10.9.0 / 10.9.1 / 10.9.2+