Just needs a label. A single character is fine. New IR codes added in sofware are labelled 'Learned'.
My understanding is that it does not crash the remote, but rather the simulator.
Edit...
Ernie, maybe my statement was incorrect about simulator not liking buttons with no labels. Maybe it is the other way around. See my reply to your Default CCF thread.
Last edited by Lyndel McGee on May 13, 2014 21:00.