I don't have any specific suggestions to actualy fix this, I'm afraid. However, a couple of suggestions about debugging this might help. It looks like you possibly aren't staying logged in independent of voting or not. Try changing your theme under user settings, so it's visibly obvious if you're logged in or not. Also, Mozilla has a cookie viewer, so Dillo probably does to. You should have a cookie from perlmonks.org (or the domain you're using) named userpass with the content (username)%(long hex number)%(short hex number). (BTW, don't let that leak out to people you don't trust; the middle hex number is a reversable encoding of your password IIRC.)