After I moved my zenphoto to the root gallery the index is not working properly. When I use the main page (password page) on my address bar it gets stopped. I get on the error log, “PHP Fatal error: Call to a member function .... “. After the # mark is erased on the address, I can view gallery index and works fine. Also noticed when I use http://www.mydomain.com/index.php i am not getting any errors. My website is working fine.
When I use through the zenphoto folder, there are no errors that I can see. Website is working fine. After I moved to the root, I ran setup two times but no hope. Please help to correct this issue.

Please see:
http://www.zenphoto.org/news/i-have-moved-my-zenphoto-installation-on-my-server-and-now-all-urls-are-wrong-

That’s the instruction I followed to move to the root and ran setup two times too. But after I enter the password it gets stopped on gallery page. (On address bar, display www.mydomain.com/#) when I erase that # mark on address bar, it works fine. When I type www.mydomain.com/index.php instated www.mydomain.com no issues. I copied to a different folder and then it works fine.
I found this on lib-auth.php

Do I have to change anything here?

You don't have to change anything in core files ever! Make sure you moved all files, fix any issue setup reports and that your browser has cookies enabled.