I don't think we're talking about the same thing, because there is no "Show quoted text" option on these emails. It's not that the reply form isn't available; it's that as of some time last week, clicking on the Post button results in an error message instead of posting the reply. There's a note about it on the LJ support (http://www.livejournal.com/support/) page.
(no subject)
Date: 2005-03-05 07:04 pm (UTC)