Ah, do you have the font of your browser enlarged? I do, so I sometimes "lose" those lower menu items. If so, temporarily, change your browser font to a smaller percentage and you should be able to scroll down to access those items at the bottom, including "Log Out." If that is not the problem I'm not sure how to advise.
Edit...I just noticed the "Log Off" menu item is not available from G2G. I went to my profile page and it was there at the bottom where it should be.