Hello Jason,
I just got my first flirc, but I am getting the error in the OP. I am running Mac OS X 10.9.2, GUI v1.2.2, and Firmware v2.3. I am using the GUI in "Full Keyboard" mode, and am programming for MythTV. I have tried disabling 'built-in profiles' with no luck. I have tried "Force FW Upgrade", "Clear Configuration", and the "erase" button. Nothing helped.
Order of events:
Programmed my URC-8820N as a true MCE remote.
Programmed flirc and everything seemed OK, but flirc would only respond to every other button press.
Tried reprogramming the button press in case the remote button was alternating codes, with no success.
Programmed my URC-8820N as a Xbox DVD remote.
Tried programming flirc, but got "Button already exists" message.
Tried everything listed above with no success.
-Tom