I think I know what this was. In KDE 4.1.1 several widgets would get
black dots when they were focused. I suffered form this bug too.
Everything seems to be OK in 4.1.2 though.
** Changed in: kdebase-workspace (Ubuntu)
Status: Confirmed => Fix Released
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intrepid: rendering bug on kde4 desktop
https://bugs.launchpad.net/bugs/274920
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