I've found the problem! At the top of the Plugin Settings page there's the setting "If you would like to disable the NoSpam! system, please select No here."
It's set to 'No' by default. I've set it to 'Yes' and it all works. Mind you the question appears twice but I guess that's something in the template code!
I would suggest that the option question is simplified to make it clearer:
Disable the NoSpam! system? Yes (Disable) No (Active)
|