PiedType informed me earlier that WordPress.com has killed the old stats page and redirected the URL to the new one. Anyone with my stats redirect script would have encountered an infinite loop as the script would redirect to the old stats page, which would redirect to the new stats page.
I have put out a temporary hotfix that disables redirecting altogether so the infinite loop stops happening and am working on redirecting to the classic dashboard stats instead. If you have auto-update enabled for the script, you should receive it soon. Otherwise, you can either disable it until the new version comes out or you can reinstall it.
More details to come in the next post.