This is a bug with the nvidia drivers. (See here:
http://bugs.kde.org/show_bug.cgi?id=155070)
It is fixed in the latest beta drivers.
** Changed in: linux-restricted-modules-2.6.24 (Ubuntu)
Sourcepackagename: kdebase => linux-restricted-modules-2.6.24
Status: New => Confirmed
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Visual artefacts when scrolling upwards
https://bugs.launchpad.net/bugs/257338
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