I too have an error with WordPress.com stats which I have installed as instructed.
I registered and was emailed an API key, which I added where indicated.
I now have the following error:
WordPress.com Stats needs attention: please enter an API key or disable the plugin.
It has an API key installed. I have also tried to change the API key but am unable to as the link in the admin panel will not allow it.
I have checked my theme has the footer tag included and it does.
Can any body shed any light on this please??
Many Thanks in advance