First off, the whole 'right out of the box' didn't work for me at all, even witht he latest version of PHP on the server I want to put this wiki on. I switched to a flat file database and that works like a charm.
However, the admin.php is giving me difficulties. I input my preferred user/pass and then access the page to login but after I enter the user/pass the dialog box just pops up again. It's a repetitive process. The login is not verifying and proceeding.