This is an attempt to curtail the volume of spam we've been getting lately by forcing all new posts to go through one place first.
Once your first post is approved no other posts you make will need to be approved.
Hopefully this'll make it easier to deal with them. If not or it introduces other issues then I'll re-think it..
Be aware, this forum isn't the most actively watched. Your post may take between 24 hours or even a month to finally approve. It's nothing personal against you, we're not here all the time.