This plugin enables you to comply with the UK and EU law on cookies.
If you are using the free version your API key relates to a specific host domain.
So http://www.mydomain.org might work, but mydomain.org (without the www) might not.
Be sure that you enter the correct host domain when registering for your API key.
The recommended way of avoiding this problem is to create a 301 redirect so all requests to mydomain.org get forwarded to http://www.mydomain.org
This may have SEO benefits too as it makes it very clear to search engines which is the canonical (one true) domain.
Support for Cookie Control is available via the forum: https://groups.google.com/forum/#!forum/cookiecontrol
You can also contact the plugin contributors directly: