After installing some new programs an error such as this may occur after logging in. This seems appear when a KDE program is installed onto Gnome. It is a simple fix. The permissions of .ICEauthority in your home directory need to be changed.
To do this first;
CTRL+ALT+F1 to change xsession will take you to a terminal
then type (replacing x to be your username)
sudo chown x:x /home/x/.ICEauthority
sudo chmod 600 /home/x/.ICEauthority
Restart, log back in and you should be working fine again!
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