Just got an HR24-100 to replace an old HR20. It's connected (for video) via HDMI to Panny TV, via Optical (for audio) to Panny HT. Had for 3 days w/o issue. Today the HR24 updated to the new HD GUI. I noticed on about 8 HD channels (Hallmark HD Movies, MGMHD, a couple of Starz HD channels, etc) there is no sound. I switched sound from HT to TV, still no sound on these channels but do get an intermittent garbled sound. I reset the HR24, still no sound. I did another reset and forced software download and it reverted to old GUI. Now I have sound on some of the problem channels (Hallmark HD movies) but still no sound on some others. Anyone ever seen anything like this? Thanks!