MyBB/Zingiri forums – Please Help!!!

There seems to be some sort of a caching issue with this plugin, and when you are in the plugin dashboard, every time you click on a new section of the dashboard, you are prompted to log back in. Unfortunately, that means when I am trying to fix the caching problem in the dashboard, I get signed out and it never saves.
I have had some help from their forum, here in this thread: http://community.mybb.com/thread-126359.html
Unfortunately they are slow and no one seems to be able to help. My thread is on the last page.
I have done everything they suggest – changing the settings.php file, regenerating that file, clearing my cache, changing permissions, and attempting to change the settings in the dashboard.
The site I’m working on is http://www.ijustmetu.com.
If anyone can help at ALL, I would so appreciate it! My client has put a lot of work into his forum and I don’t want him to lose his work.
Thanks!
Elaine