Currently we are getting a large number of spambot registrations on the forum. While most of them never get their account activated, some apparently manage to get through and post spam topics on the forum.
To combat this, we have activated a new feature: when a newly registered user tries to post a reply or a new topic, his posting will be held for approval. One of the moderators will take a look at the posting. If the posting is spam, it will be deleted and the user will be deleted. If it is "legit", it will be approved and will appear on the forum.
This will only happen for the first posts that a new user does, so after you've done a few posts you will no longer need moderator approval for your contribution.
I'd like to make it clear that this is strictly an anti-spam measure and not in any way meant to censor opinions.