I have used it on two different receivers a denon AVR-589 and a sony STR-DE545. It only started when using windows 7 and the new drivers from realtek. Windows Xp Did not have the problem
Don't think i can call it a problem, more of an annoyance. I have installed the new 64 bit drivers from realtek for windows 7 and for some reason the spdif output is only activated when a sound is played, so whatever sound is played gets the begging cut off. Never had this problem with XP.