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this effect is also visible on this very website xenforo.com when viewing a specific Forum-list or a Thread.

When I click on that small icon for the "quick navigation menu" , then it flickers a black-colored background.

This effect is not visible when doing the same at the Forums-Homepage.

I remember this strange behaviour was not there before the release of XF 1.0.0

using FireFox 3.6.16