Hi, I hit this again so I suspect it is something that was caused by my recent upgrade: $ grep xorg /var/log/dpkg.log|grep upg 2010-03-24 23:37:17 upgrade xserver-xorg-core 2:1.7.5-1 2:1.7.6-1 2010-03-24 23:37:42 upgrade xserver-xorg-dev 2:1.7.5-1 2:1.7.6-1 I will downgrade back to 2:1.7.5-1 for a while to verify this claim.