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Thanks for the ideas.
Its whole sections that arent appearing and its not consistant. ie all between two rows of knife inserted vertexes can be shown sometimes and not others. The one consistant thing is that if I zoom the view untill the edge overlaps the area, they'll always appear.
I'll take a couple of screenies to illustrate.
Latest graphic drivers and put a borrowed 1GB stick in and there was no change, but thanks for the suggestions.
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