That's how it's supposed to work.
Once blocked, a member cannot do any of the following:
- post notes to your account
- send you messages
- accept your game seeks
- be auto-matched with you in open seeks
- join tournaments that you are running
- post in content that you created
I've blocked 2 players so far, but they are still able to join my games. Call me a stickler, but when I block someone shouldn't they... uhm, be blocked?