Arduino IDE Serial Port Problem El Capitan - Device not found!

Running OSX El Capitan 10.11.2, Working with Arduino Due.

Whenever I try to upload code to the board I get the error: "No device found on tty.usbmodem1411"

I have checked it out on some other forums but it doesn't seem like a real solution has been found. Something to do with device driver permissions on El Capitan?? Seems to be a know problem with no recent attempt being made to fix.

On a deadline for a school research project using this board. Renders my ability to design anything pretty useless. Please HELP!!!