Just installed this on a Pressflow site (Drupal 6.22 optimized for performance). It's enabled, I went to the settings page, marked it to only track unique content views, and... it's not working. Every time I reload a content page the view count keeps going up. As an anonymous user, as admin, as a regular logged in user... it keeps increments the page count on every page load.

This is on a Panels page. Where the actual view count is in a views block.

Does it not work with Panels?