Delete a Gnome session

In case of problems with a Gnome session it is often the best way to just delete the Gnome session file. For example it can happen that the current settings of your session is not being saved anymore.
The following command helps:

rm /home/xyz/.gnome2/session

Then go to the session settings: Desktop->Preferences->Sessions->Session Options. There activate the second hook so that sessions will be saved automatically. Finally press the button to save the current session.

Everything should be fine again.