Thanks Jason - if its working as intended it may not need anything changing.
I just tried to replicate the issue reported to me, and seemed to find the opposite was true - i.e. I couldn't log out even if I tried. Even after closing and re-opening the browser.
If you could have a little look and confirm that everything is behaving correctly that would be good though.
The behaviors reported to me was ticking the log in automatically box, but apparently having to log in again on one of the lodge pages with the login form, e.g.:
http://www.safariawards.com/africa/zarafacamp/
Presumably after visiting a few other pages.
Details below.