I have been running an HTPC using Win7/WMC and a Ceton InfiniTV4 tuner with good success for 2-1/2 years now. PC HDMI outputs direct to Sony TV as my pre-pro did not have HDMI inputs. Sooooo, I upgrade my Pre-pro and use its HDMI input/output to the Sony TV. Desktop and WMC screens come up fine, I can play back recorded TV no sweat, but when I tune to Live TV....pow!....HDCP error blue screen. Interestingly I can trick it to work. Switch inputs on the pre-pro to a non-HDMI source, then back quickly. I then get live TV, but in a small res, about 30-50% screen size. So I do the switch off and back trick again and bingo, full screen and perfect picture which remains stable until I stop Live TV. Anyone ever heard of this kind of goofiness??????
Assassin HTPC + Echo, Sony 49XBR850, McIntosh MX151, MC202, MC7104, MS300, B+W 803D2, CWM's, Janus 1W Sub