@Stefan: given that you are running an nvidia card, your issue may be related 
to mine. I've filed a separate bug:
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-96/+bug/585685
Have a look at that & see if perhaps it may be caused by your nvidia-173 
driver. If so then it's something common between the -96 and -173 drivers.

-- 
black screen after a few user switches
https://bugs.launchpad.net/bugs/546578
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xserver-xorg-driver-ati.

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