Looking at the file on my system it shows with -rw------- permissions, ie 600 in octal language, not 644, but I don't think that would make any difference when trying the chmod command.
Try renaming the file from Ctrl+Alt+F1 command line with
Code:
sudo mv /home/user/.ICEauthority /home/user/.ICEauthorityOLD
which is one answer I have seen mentioned before many times.
Just out of interest, have you made use of sudo to start graphical applications instead of gksu or gksudo, as that can cause this problem. Srr Root-sudo in my signature for details and explanation of what you should always do.
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