When logged in on bugzilla, it asks me my username and password before every single page. this also makes walking my list of bugs impossible - I don't get next, previous etc. links after comitting changes to a bug. I've verified that I do have some cookies from bugs.gentoo.org. This happens in konqueror, links and galeom. Disabling cache and proxy didn't help.
I've tried it from my other computer, and it works here. I can't think why though, because the only difference that comes to mind is that the first comupter is behind a NAT and this one isn't. I'll be investigating further, unless the nat suggestion raises some idea you can disregard this bug for now.
Apparently this was caused by a stale and broken cookie from gentoo.org. I deleted it and the problem has gone away.