This affects me too. No problems w/ proprietary nVidia driver.
Switching to 'Best Shapes' seemed to resolve the problem for me.
xserver-xorg-video-nouveau:
Installed: 1:0.0.15+git20100219+9b4118d-0ubuntu5
Candidate: 1:0.0.15+git20100219+9b4118d-0ubuntu5
Version table:
*** 1:0.0.15+git20100219+9b4118d-0ubuntu5 0
500 http://ubuntu.mirror.frontiernet.net/ubuntu/ lucid/main Packages
100 /var/lib/dpkg/status
00:0d.0 VGA compatible controller: nVidia Corporation C61 [GeForce
6150SE nForce 430] (rev a2)
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Fonts "chipped" with subpixel hinting enabled on NV46 (G72M Quadro NVS 110M,
GeForce Go 7300)
https://bugs.launchpad.net/bugs/554296
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