Why can't i use Arduino with Mac OSX El Capitan?

Created an account to say thanks to dgsterling and everyone else who contributed to this thread - I followed the exact steps in order (including using the USB hub) when using a Funduino Nano V3 that a friend sent from China (and before people get angry, I own a lot of genuine Arduinos too). It also continues to work after re-enabling csrutil (I'm paranoid). The port that I now use on Arduino is called /dev/cu.usbserialXXXXXX.