This quite old thread has a broken reply button: https://forums.gentoo.org/viewtopic-t-465367.html Pressing reply forwards to the start page. The only way to reply it using the quote button on some of the posts. I'm using FF-14.0.1 on ~amd64, connection via http proxy. With this setup all other threads are working fine using the reply-button. Reproducible: Always
Your browser is caching a redirect from when you were not logged in. Clearing the cache should allow you to reply normally. Once that is done this should not reoccur, as redirections are now explicitly to not be cached.
Works now.