Hi, I don't know what had happened but THX Spatial Audio suddenly not showing in Playback device list. Tried asking the customer support but they couldn't be any help and asked me to contact my pc manufacturer. However, I know it is not related to hardware issue because after that I downloaded Razer 7.1 Surround Sound and it works fine. Anyone knows what actually happened or the software need updates or the Window updates have killed the software? Thank you.