Sometimes such black regions appears on screen
black_square.png (image/png), 16.14 KB, created by Dmitry on 2011-07-06 14:25:20 UTC
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Creator: Dmitry
Created: 2011-07-06 14:25:20 UTC
Size: 16.14 KB
Actions: View
Attachments on bug 22324: 48837

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