Here is a more permanent fix for the FTDI mavericks issue, use at your own risk, not sure what this might break as far as other USB devices you may be using. If you run into issues, just move it back to its original name.
Type the following commands into the terminal:
sudo mv AppleUSBFTDI.kext AppleUSBFTDI.disabled
sudo touch /System/Library/Extensions
Restart your computer
Of course you can continue to just issue the following command after reboots (and after first attempt at accessing the FTDI)
sudo kextunload -bundle-id com.apple.driver.AppleUSBFTDI