I have 3 VideoSeven screens running off to identical PCiE cards, and I have just noticed that they all have the same mark which looks like the old burn marks you used to get on CRT monitors. All in the same place and all a white streak that only appears when a dialogue box with a white ground is moved across the place where the marks are present (a 1/4" wide mark about 2" down on the left hand side and stretching half way across the screen to nothing). It looks vaguely like the mark left by the last dialogue box that was there. any ideas anyone? Changing the refresh rate only makes it worse, the drivers are the latest.