Well I seen a black area once, but this might have been something different. They issue does not appear to happen when I disable compositing in KWin with Alt-Shift-F12. If you wish I can put this bug upstream at freedesktop.org. Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7