We've also been dealing with an increased amount of traffic. In order to ensure LiveJournal's overall availability, we've take a couple of measures to minimize the impact of this traffic. Unfortunately, this has the side effect of preventing some users from posting long entries or comments. We're working on resolving this problem as soon as we can. We apologize for the frustration it's causing.
I presume ‘increased amount of traffic’ is euphemism for ‘Distributed Denial of Service’.
I’ve got a backlog of at least three of those boring quizzes to post.