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I am also having this problem. I've turned off my firewall completely and I have globals set to on. When I try to access the admin.php it tells me I am not authorized for this area and redirects me to the index.php. I have logged in using the admin info I created during install but it gives no links to admin and won't let me in no matter what I try.
This system looks awsome. I wish I could get it going somehow :(