Hello,
I am having a similar issue to the IIS5 and path problem mentioned in another section of the forum. I have the zengallery in place and I can navigate to the default template, but I get stuck in a continual loop on the admin.php page. I have tried all of the suggtestions here
http://www.zenphoto.org/support/topic.php?id=1527&replies=4and here
http://www.zenphoto.org/support/topic.php?id=933both the setup and admin pages loop when trying to login. if I use an incorrect password it does get flagged as invalid.
at a loss,
-James