I've just installed a new wpmu 2.9.1 and added the anti-splog plugin. I have a premium.wpmudev account, and an API key. I have added my server: pingmusic.com.au and IP address 10.160.51.128 to my Anti-splog API profile.
However in my dashboard (in the new 2.9.1 wpmu install) whenever I paste in my API key and click "check key" it tells me that:
There was a problem with the API key you entered: "Your server IP and WPMU Site Domain is not yet registered for this API Key. You are attempting to connect from 188.8.131.52." Fix it here»
When in fact my domain and IP is registered against the API key.