Comment 69 for bug 41301

I also have this problem on my 8.04 64 bit system, I have tried downgrading all xorg stuff to the base versions but it didn't help. Nor did upgrading my NVidia drivers to the latest available version.

I noticed this appear sometime around December 2008, so I imagine some update back then was the source as I did not recall it before that period.

If - as a previous poster has said - reinstalling Hardy fixes it, I can only assume that some configuration somewhere was changed by an update that has now being fixed/deleted, but the update changes were never rolled back (but all the current updates are ok).