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0e1f616
(Get the code!)
I think it isn't depends on the video card.
I has this problem on different cards too:
- Nvidia (6600)
- Intel Integrated G950
- Via S3 Unichrome
- Trident something...
This problem is very annoying. I think this lines comes from the pages that isn't rendered yet, and which only has this grey X. If you scrolls fast, faster than your machine renders (at my shitty machine it isn't rare) then these Xes somehow gets out from kpdf.
Once i saw that this lines appeared on an image inside a webpage in firefox. It isn't cleared when i scrolled up/down, neither for simply refresh (without redownloading the image). So i think it somehow overwrites the other applications memory, or buffer, or something like that. (It's just an opinion i'm not adept in this stuff).
I have attached a video, that describes the problem more precise, than my english grammar;)