I restarted Ubuntu a few minutes ago, and got a warning dialog early in the bootup process (before the desktop was up)...
It wasn't just a scrolling message which flitted off the screen of its own accord.
It was a dialog which stopped proceedings, until I acknowledged it.
Could not update ICEauthority file /home/me/.ICEauthority
What, Why, and Who dun it? :)
Your .ICEauthority file probably isn't owned by your user (maybe because you ran something as root/with 'sudo' that has overwritten it). You can check this by running (in a terminal):
ls -l /home/you/.ICEauthority
If it says something other than
-rw------- 1 you you ...
you need to make it owned by your user again:
sudo chown you:you /home/you/.ICEauthority
maybe you also need to correct permissions:
chmod 600 /home/you/.ICEauthority
To avoid such problems, don't run X applications with 'sudo' - use graphical sudo instead (addendum by Murat Gunes).