These settings might help:
http://www.nvnews.net/vbulletin/showthread.php?t=118088
my xorg.conf options (not sure if these should be here):
Option "PixmapCacheSize" "1000000"
Option "AllowSHMPixmaps" "0"
Option "PixmapCache" "1"
Option "PixmapCacheRoundSizeKB" "1024"
Option "InitialPixmapPlacement" "2"
Option "GlyphCache" "1"
from command line:
nvidia-settings -a InitialPixmapPlacement=2 -a GlyphCache=1
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[G86GL] Latest NVIDIA drivers: X hangs with blank screen after logout.
https://bugs.launchpad.net/bugs/258357
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