I have just installed and have professionally calibrated Sony G90, sat 200. It works perfect on 720P but will not Sinc(?) on 1080i. The picture will be fine for a few seconds but will flicker dark and light every few seconds. No one at Sony can figure it out, yet. I am only watching Channel 199 on DirectTV, no OTA. The projector has been calibrated for both 1080i and 720P. The picture is great on 720p but I would like to have a stable picture on 1080i. The picture on1080i is perfect but will flicker to dark every few seconds. The scaller is Hd passthrough and I have talked with Phil (***) and he doesn't think it is the Rock. Any suggestions?