I can also help test, I’m getting this issue too.
Does this help? This is an nginx error I’m getting.
2011/11/04 18:22:45 [notice] 792#0: *15 “(comment_author_.*|wordpress_logged_in.*|wp-postpass_.*)” does not match “PHPSESSID=kvenjuca3d27rag50aog1eg717; wordpress_test_cookie=WP+Cookie+check; wp-settings-1=m1%3Do%26align%3Dcenter%26imgsize%3Dlarge%26m5%3Do%26m2%3Do%26m9%3Do%26m4%3Do%26m11%3Dc%26m8%3Do%26m12%3Do%26editor%3Dtinymce%26uploader%3D1; wp-settings-time-1=1320266243; kvcd=1320425075982; km_ai=PJWgA%2FCmS3CNz6QISaL8lf7wrEk%3D; km_uq=; km_lv=x”, client: 4.59.22.2, server: mydomain.com, request: “GET /wp-login.php HTTP/1.1”, host: “www.mydomain.com”