I've seen instances with CRT's where when they are not perfectly focused (ie lines are blurring a bit on one side) and then converged, you won't get a perfect transition between blanking and picture. It will look a little blurred at the transition.
I believe that focus is the most important step to setting up a focus and if you focus correctly you will get a much better and sharper convergence which translates to picture quality.
I don't know what's causing that and I don't have that problem, but I do know what will fix it.
You can mask that side of the screen with velvet instead of using the blanking. I have a velvet strip across the top of my screen that hides the AKB line very nicely. Open the blanking up a bit then mask it conventionally. You may lose half a percent on the left but it should fix your problem.
It's good to lose a pixel or two all the way around in my experience since so many dvd's leave stray stuff there.
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