I just chekced, you're using
www.clubadventist.com and clubadventist.com without the www interchangeably. This can create issues. Cookies for www and without the www are different. So you can be logged in at
www.clubadventist.com then click a link which doesn't use the www and boom you're not logged in anymore.
Try using one domain consistantly, that should eliminate the problems.
