Problems connecting to Mac OS X

ROBO 3D printers sometimes have trouble connecting to Macs, and the following articles may have some helpful information: 

• http://forum.arduino.cc/index.php?topic=198539.0
  
• http://www.ftdichip.com/Support/Documents/AppNotes/AN_134_FTDI_Drivers_Installation_Guide_for_MAC_OSX.pdf