I first noticed the errors after posting articles. The post is published and a simple Refresh used to fixed this error.
Today, when I first visit the site, it wasn't working at all. It was a 502 Bad Gateway error. After some tests, the blog was working on other browsers. I cleaned cookies from Firefox and it was ok.
After I post my first article today, the error is back. If I clear the cookies, the site works ok.
What kind of cookies Wordress uses?
Could it be a Firefox 3.1 beta 2 error?
What can I do about it, it's annoing...