Gutsy un-hibernate plus ctrl+alt+bksp = reboot ?

[(=?utf-8?q?=60=60-=5F-=C2=B4=C2=B4?=) -- Fernando]

I did a fresh install of Ubuntu Gutsy last week. I never had much luck with previouse versions and the Hibernate to disk function.
This time it seems to work quite well, and it even un-hibernates.
But after I login, the X is quite strange leaving artifacts and now showing the contents of every window.
So I decided to restart/kill X with ctrl+alt+bksp.
Instead of the espected GDM restart I was presented with a system reboot.

Does anyone else experiences this?

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