I am currently using the WP.com Stats plugin at this site:
When I first installed it, it seemed to be working. Then, it stopped registering page visits and hasn't for almost a month now.
I tried uninstalling and reinstalling the plugin and the current status page says it's configured properly and working.
Did I somehow make a change to my theme or something that stops the plugin from reporting to WP.com servers or otherwise keeps it from recognizing page views?