Problem as stated in the title (i5-4670k). I have disabled hybrid sleep in Windows 8 Pro and disable c6/c7 sleep in BIOS. 3 power supplies and 2 pair of DDR3 later still having problems reliably turning computer on and off with the remote. Tried both USB 2.0 and USB 3.0 ports. Symptom - usually power on via case button, power off via remote, power on via remote, power off via remote, hang powering on via remote with light on USB receiver solid red. Sometimes it makes another cycle before failing and rarely it hangs going to sleep again with solid red light.

The same remote and receiver works reliably on Windows 8 Pro with Media Center on a GA-Z77X-UD5H and i5-3570k.