I removed cookies, still the same.
Autocomplete does work. as soon as i start typing my name it completes it. but doesn't fill in my password.
Opera does remember the password, so the site doesn't block this.
Maybe it has to do with the fact that it is an httpS site, and every time i login i get a message that the info i filled in is sent over a non-secure connection? (opera gives a similar message, but still remembers)