I have a working so accout, and today I've logged in via openId to serverfault as well, and copied over my account detailes from so.
I can login to serverfault with no problems. However, when I visit my own question http://serverfault.com/questions/88618/lighthttpd-fastcgi-php-phpinfo-crashes, I'm logged out. When I follow whichever other link within serverfault, I'm logged in back.
The only place where I'm counted as guest is on my question page.