Coverflow causes external display to flicker when rotated

Hi,
I have a new MBP 15", 2.2GHz, 2GB with Leopard installed, and I have an external monitor (a Lenovo Thinkvision L201p) which can be rotated into portrait mode, and that is how I use it almost all the time.
The problem I have is that whenever I browse something using coverflow, be it in the Finder or in iTunes, the external display flickers (sometimes quite badly) as the items move. This happens even if the application that is using coverflow is on a different space (for example, if I have iTunes on a different space and it switches to a different song). It only happens when in rotated mode, in landscape mode the flickering goes away.
Does anyone have any ideas what could be causing this? Maybe an issue with the video driver? Can someone reproduce this?
Thanks.

This was solved in 10.5.3.

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