Guys as per my post above on the 15 Aug 2016 it appears that the FLIRC cannot interpret Microsoft Media Center IR codes correctly. This means you cannot use an actual Microsoft Media Center remote (nor a Logitech Harmony remote that you've configured as a Microsoft Media Center remote) to: To send IR codes to the FLIRC and map a key press to this code ie how you normally program it. (As you will get the "already exists" errors for other keys such as skip forward & skip back)Send IR codes to the FLIRC when its plugged into your computer.The solutions: If using a Harmony remote see here for the solution: https://support.flirc.tv/hc/en-us/articles/201676079-Harmony-Remote-ControlIf wanting to use a spare remote you have make sure its a NONE Media Center remote (and also one that your other devices won't respond to) then map those IR codes to key presses using the FLIRC software.Hope that helps.