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Had the same problem testing on a local machine. Although I haven't checked the code base, XOOPS seemts to be very dependent on cookies to manage session. Turning off cookies on the browser won't allow you administrator access in the default install. This was my first clue. You might want to check if session_use_cookies is set to 0. I adjusted this to 1 and presto, my admin user menu appeared. Hope this helps.
