This is pretty weird The projector at first is fine and then after around half an hour or so the picture deteriorates and there is ghosting around object edges.It almost appears as coloured shadowing.It can then dissappear and all is fine. Whilst occuring I switched on the Rock internal test patterns and noticed that on crosshatch the vertical lines were tinted blue and horizontal lines were white.I connected to a pc monitor to check if this is the same but no it was fine.It is most noticeable on the overscan test image.An internal genlocked pattern is all white . When all seems fine the test patterns from the Rock are better but the overscan still is blueish on the verticals. I used different cabling to connect a monitor but the cable seems in great shape to the CRT and I suppose I could check that one if I had to. any advice?