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Old 14 April 2017, 16:25   #5
mark_k
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Join Date: Aug 2004
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Posts: 3,343
I'll have a look through the code but I'm sure nothing will jump out.

This problem isn't driver-specific, though perhaps the manifestation could differ between drivers. I checked with my laptop (Nvidia driver). Setting h. and v. size controls to 2×, the issue was still present. At varying window sizes there were sometimes both horizontal and vertical "glitch lines". Same for 3×.

Attached pics taken on my laptop.
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