After upgrading to WP 2.7. in administration panel I saw that I become a simple user: no access to plugings, options, nothing. Just to writting new posts and editing comments to those posts.
I looked in phpMyAdmin and I saw that all users (including admin) have been resetet to user_status 0. Changed that, nothing happened! It seems I am still admin, but I cannot access anything except writing new posts. Any ideas?