On Fri, Dec 07, 2007 at 08:42:30AM -0500, Michael Pobega <pobega@gmail.com> was heard to say:
From what I remember you're generally not supposed to run any sort of
updates while in an X environment; If I were you I'd quit X and change
to TTY1 before administering any changes (Especially if the changes are
X.org or libX related)
I always upgrade from within X. I don't remember ever having serious
trouble, although I think Gnome/KDE and Firefox might have trouble.
Some display managers will kill your session when they're restarted --
but that hasn't happened to me in ages, so I guess either that was fixed
or it's suppressed on upgrade.