I know this is a frequent issue, but I've never seen a post with a resolution. Perhaps someone can help direct me. Every HTPC build / home receiver combination I've used over the last 15 years always has the same issue that audio output doesn't kick in for about 1 second after the signal is sent to the receiver. It appears that this issue is specific to when the audio is passed to the receiver over HDMI only. For watching movies, this isn't much of an issue since once the audio switches in, it stays on, but it is an annoyance since the clicks when moving between icons and other small duration audio samples that are about 1s or less in duration never get output to the speakers at all. I spoke with Onkyo (my current receiver is RZ-810) and they say this is a common issue with connections to PCs and that the only resolution would be a software fix and there is no receiver setting to tweak. Does anyone have any info on how to set either Mediaportal, PC sound settings, or LAV tweak so that this doesn't happen?