Hey,
I also noticed that behavior. My Harmony Ultimate One and Streacom FLIRC-SE only seem to wake my Windows 8.1 HTPC sporadically. I added an second wake command to "Watch Series/Movie" action profile to be sent when activating it.
I enabled sleep detection and built-in (Harmony) profiles in the advanced options of the flirc gui. Firmware Version is 3.6.
Are we doing somehing wrong?
Thanks in advance.