Sadly, my new computer has a fresh installation of Mavericks (10.9.1). I read that getting any Arduino boards that use the FTDI driver is somewhat troublesome after reading a thread on this forum back in November. The thread states a "workaround" that disables Apple's own FTDI driver, in order to use the latest FTDI 2.2.18 driver. I wanted to check before I start disrupting things by typing commands into terminal, etc. that this was still the case?
If so, why on earth have Apple written their own driver that clearly causes issues?
After a half a day of fussing with drivers, etc, I have just got the FTDI drivers for a UNO board running on my new iMac wMavericks 10.9.1. Unfortunately I am sure some of what I initially tried was an useless exercise, but here is a path to success that appears to work -- at least it did once for me.
No changes are made unless you Shut Down for the Apple menu, and then power up and reboot the Mac. Restarting from the Apple menu did not work for me. (Its a little known fact that every Mac from the very first reacts differently to "RESTART' vs an power shutdown and reboot. Over the years I have a power shutdown always produces the best results.)
While loading new drivers, the Arduino must be unplugged from the USB port.
First I used an app suggested in the "Getting Started" section of arduino.cc to download the FTDI drivers. This link also downloaded a small app that disables Apple's new (very flawed) FTDI drivers.
Then I Shut Down the Mac and rebooted and ran the installation of the new drivers (FTDI 2.2.18)
Then I Shut Down and rebooted the Mac again WITH the UNO board plugged to the USB port. The new drivers showed up in Tools>Serial Port as "/dev/tty.usbmodem1421" and "/dev/cu.usbmodem1421". I used the tty version and everything worked.
I am sure this is not the only way to get the FTDI drivers loaded and running, but at least it worked this time for me. Now I need to get drivers running for the Pro mini Arduino w/Sparkfun FTDI driver hardware. Should be fun -- NOT!!