Hi, My Sony projector starts out fine from cold, but after about an hour or so one small portion of the display (around middle top)seems to take on a slight green cast. "Dark" movies with greys are most affected. For example smoke from a chimney in a movie scene will start out blue/grey then as it passes through the affected area of the display the smoke turns sickly green then back to blue/grey. Similarily, off-white walls are tinted with green in the affected area. The rest of the display remains perfect (or at least consistent). It is very noticable on B/W movies. Very annoying. Might I have a problem with the LCD panels themselves, associated electronics, or maybe excessive heat? It isn't something I have been able to correct via normal user adjustments.Before I return my projector to a service centre, I would really like to get some idea of what might be happening. Thanks. Carl.