Hi,
GUI Version 1.3.0
Firmware Version: 3.3
GUI installed on Ubuntu Version 14.10 x64
flirc then moved to a Raspbmc (running from a reputable power source)
In the GUI, when I go to the "Controllers" menu & select "XBMC" I can program everything exactly as it is supposed to.
When the flirc is plugged into the Raspbmc, all programmed buttons on the remote work exactly as expected - apart from the Power button on the remote which instead of powering down XBMC just loads the home screen & highlights "System". I've duplicated this on two completely different remotes, so it appears to be the keyboard code that the GUI attches to the "Power" button from the XBMC Controllers screen, rather than anything else.
Apart from the 2 tiny glitches (I raised another GUI bug on the forum too), flirc is a fantastic bit of kit & I had it up & running in next to no time. Of course, it helps that I have a draw full of old, obsolete remote controls too. :P