I logged in, got a page not found error (the screen, according to the address, was the intital select airport screen). Then I closed that tab and opened a new AM tab (to try to log in again before I reported here), and discovered I was logged in. (Go figure.)
At the top of the page I see "Array ( [security] => 4 [user_id] => 7641 [admin_id] => 7641 )". That's my ID, and I'm clearly in my account, so I assume either its a bug or a debugging thing you just turned on?