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I did some more testing, and the problem is not as straight-forward as I thought. I have two DVD sources and two displays, a TV and an LCD projector. In both pairs the newer item is a Toshiba. The problem only happens if both DVD and display are Toshiba. Connect the Toshiba DVD player through the Iscan to projector and all is OK; Connect my old Wharfedale player through the Iscan to the TV and all is OK; Connect Toshiba DVD player through the Iscan to Toshiba TV and the problem occurs.
I have found one movie DVD where it definitely doesn't happen, "Liberty Heights", presumably because that doesn't have macrovision (apparently not all do because the movie-makers have to pay to use it.)
Movies with aspect ratios greater than 2.0 are not a problem, because if affected the affected area falls within the black bars anyway. Oddly enough though, if I use "Cinema mode" on the TV to stretch the picture and get rid of the black bars, the problem then appears at the top of the stretched picture.
Is it possible that the Toshiba products are deliberately designed to work together to screw up the picture if there is a third device in the signal path? (Presumably the motive would be agressive implementation of macrovision.)
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