Thanks for that! It did the trick!1. Some automatic function in Options->Video->Geo?

Unfortunately I already had that set up, and still I can't watch 1080p H164 without desync. I can watch 1080i MPEG2 without desync. Perhaps it's an issue with H264 video? The audio stream is MPG.2. Audio renderer must be Prog Audio renderer
Thanks for the quick replies!