I have this same problem.
There have been discussion of this before but they all are “not-resolved”
The stats plugin is needed for some features to work such as having users from wordpress.com automatically have their name and email filled on my blog.
Tried various .htaccess options from this forum but none worked out.
Can someone please recommend a way to fix this? or a way to find out what is exactly causing the problem so I can fix it?