[Ingo Helbig]

Many thanks for your help Jeppe. Since posting I discovered the ‘flicker filter’ check box in the settings. Activating this has reduced the flicker problem to an acceptabele level, however made the text less sharp. Curiously the degree of flicker differed in all three titles, which I suspect has someting to do with the ratio of frames and fields to the number of lines of information. Un fortunately I don’t have the shutter option you mention, but can see this would change that relationship. Thanks for taking the time to reply.

Ingo